playlists + lyrics: setlists with pages of their own, and the words timed to the voice

Cargo.lock

@@ -163,6 +163,7 @@ checksum = "2a4385e2e34eb35d6b3efe798b9eb88096925d87726c0798709bf56d9ed84af3"
 name = "app"
 version = "0.1.0-alpha.3"
 dependencies = [
+ "audio-formats",
  "base64 0.22.1",
  "image",
  "keyring",
@@ -170,6 +171,8 @@ dependencies = [
  "log",
  "metadata",
  "player",
+ "quick-xml 0.37.5",
+ "reqwest 0.12.28",
  "serde",
  "serde_json",
  "soulseek-client",
@@ -231,6 +234,10 @@ dependencies = [
  "url",
 ]
 
+[[package]]
+name = "audio-formats"
+version = "0.1.0-alpha.3"
+
 [[package]]
 name = "autocfg"
 version = "1.5.1"
@@ -2299,6 +2306,7 @@ dependencies = [
 name = "library"
 version = "0.1.0-alpha.3"
 dependencies = [
+ "audio-formats",
  "log",
  "rusqlite",
  "serde",
@@ -3080,6 +3088,7 @@ checksum = "19f132c84eca552bf34cab8ec81f1c1dcc229b811638f9d283dceabe58c5569e"
 name = "player"
 version = "0.1.0-alpha.3"
 dependencies = [
+ "audio-formats",
  "env_logger",
  "log",
  "rodio",
@@ -3096,7 +3105,7 @@ checksum = "7da1d65da6dd5d1e44199ac0f58712d241c0f439f80adea8924d832384087f85"
 dependencies = [
  "base64 0.22.1",
  "indexmap 2.14.0",
- "quick-xml",
+ "quick-xml 0.41.0",
  "serde",
  "time",
 ]
@@ -3266,6 +3275,15 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a993555f31e5a609f617c12db6250dedcac1b0a85076912c436e6fc9b2c8e6a3"
 
+[[package]]
+name = "quick-xml"
+version = "0.37.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "331e97a1af0bf59823e6eadffe373d7b27f485be8748f71471c662c1f269b7fb"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "quick-xml"
 version = "0.41.0"
@@ -4079,6 +4097,7 @@ dependencies = [
 name = "soulseek-client"
 version = "0.1.0-alpha.3"
 dependencies = [
+ "audio-formats",
  "bytes",
  "env_logger",
  "igd-next",

Cargo.toml

@@ -8,6 +8,7 @@ members = [
     "crates/tagger",
     "crates/metadata",
     "crates/library",
+    "crates/audio-formats",
 ]
 
 [workspace.package]

crates/audio-formats/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "audio-formats"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+
+[dependencies]

crates/audio-formats/src/lib.rs

@@ -0,0 +1,166 @@
+//! What counts as audio, and what the player can actually decode.
+//!
+//! These were seven separate hand-kept lists — the library scanner, the share
+//! index, the row pruner, the loudness pass, and three in the frontend — and
+//! they disagreed. The scanner indexed `.aiff`, the pruner did not recognise it
+//! and DELETED the rows on the next startup. The share index knew `.ape`, the
+//! scanner did not. Every list named `.opus`, which nothing here can decode.
+//!
+//! One table now, with a distinction the old lists could not express:
+//!
+//! - [`PLAYABLE`] — the decoder can turn this into sound. Derived from the
+//!   codecs symphonia is actually built with (`all-codecs` + `all-formats`:
+//!   aac, adpcm, alac, flac, mp1/2/3, pcm, vorbis; caf, isomp4, mkv, ogg,
+//!   aiff, wav) and verified against real files by
+//!   `cargo run -p player --example probe_formats`.
+//! - [`RECOGNISED`] — audio we can index, share, download and show, but cannot
+//!   play. Naming these is the point: a file the app can see and refuses to
+//!   play with a clear reason is honest, whereas leaving it out of the tables
+//!   makes it invisible, and claiming it plays makes the player fail at the
+//!   moment the user presses play.
+//!
+//! Adding a codec means adding a decoder, not editing a list.
+
+/// Extensions the player can decode. Verified, not assumed.
+pub const PLAYABLE: &[&str] = &[
+    // FLAC
+    "flac",
+    // MPEG audio — the bundle provides layers I, II and III
+    "mp3", "mp2", "mp1",
+    // ISO/MP4 container: AAC and ALAC live here
+    "m4a", "m4b", "mp4", "m4r",
+    // Raw AAC (ADTS)
+    "aac",
+    // Ogg container, Vorbis inside
+    "ogg", "oga",
+    // RIFF: PCM and ADPCM
+    "wav", "wave",
+    // AIFF / AIFF-C, also via the RIFF reader
+    "aiff", "aif", "aifc",
+    // Core Audio Format
+    "caf",
+    // Matroska — FLAC/Vorbis/AAC in a different wrapper
+    "mka", "webm",
+];
+
+/// Audio we recognise but cannot decode. Indexed and shared; never played.
+///
+/// `wv` earns its place here more than any of them. A WavPack file that
+/// carries the original RIFF header in its wrapper is probed as raw PCM, so
+/// the decoder does not fail — it reads compressed bytes as samples and emits
+/// NaN into the mixer. Refusing it by extension is the only thing that stops
+/// that, because the decoder itself reports success.
+pub const RECOGNISED: &[&str] = &[
+    "opus", // no Opus decoder is built in
+    "wma", "ape", "wv", "mpc", "tta", "shn", "dsf", "dff", "spx", "ra", "au", "amr",
+];
+
+/// Is this an audio file at all — playable or merely recognised?
+///
+/// The scanner, the share index and the row pruner must all answer this the
+/// same way, or a file is indexed by one and deleted by another.
+pub fn is_audio_ext(ext: &str) -> bool {
+    let e = ext.to_ascii_lowercase();
+    PLAYABLE.contains(&e.as_str()) || RECOGNISED.contains(&e.as_str())
+}
+
+/// Can the player turn this into sound?
+pub fn is_playable_ext(ext: &str) -> bool {
+    PLAYABLE.contains(&ext.to_ascii_lowercase().as_str())
+}
+
+/// Why this file will not play, in words that can go on screen.
+pub fn unplayable_reason(ext: &str) -> Option<&'static str> {
+    match ext.to_ascii_lowercase().as_str() {
+        "opus" => Some("Opus isn't supported yet — this build has no Opus decoder"),
+        "wv" => Some("WavPack isn't supported yet"),
+        "ape" => Some("Monkey's Audio (APE) isn't supported yet"),
+        "wma" => Some("Windows Media Audio isn't supported yet"),
+        "mpc" => Some("Musepack isn't supported yet"),
+        "tta" => Some("True Audio isn't supported yet"),
+        "shn" => Some("Shorten isn't supported yet"),
+        "dsf" | "dff" => Some("DSD isn't supported yet"),
+        e if RECOGNISED.contains(&e) => Some("this format isn't supported yet"),
+        _ => None,
+    }
+}
+
+fn ext_of(path: &std::path::Path) -> Option<String> {
+    path.extension()
+        .and_then(|e| e.to_str())
+        .map(|e| e.to_ascii_lowercase())
+}
+
+pub fn is_audio_path(path: &std::path::Path) -> bool {
+    ext_of(path).is_some_and(|e| is_audio_ext(&e))
+}
+
+pub fn is_playable_path(path: &std::path::Path) -> bool {
+    ext_of(path).is_some_and(|e| is_playable_ext(&e))
+}
+
+/// Why this path will not play. `None` means "go ahead and try".
+pub fn unplayable_path_reason(path: &std::path::Path) -> Option<&'static str> {
+    unplayable_reason(&ext_of(path)?)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::path::Path;
+
+    /// The bug the single table exists to prevent: the scanner indexed a
+    /// format the pruner did not recognise, so importing an AIFF album put it
+    /// in the library and the next startup silently deleted it.
+    #[test]
+    fn everything_indexed_survives_the_pruner() {
+        for ext in PLAYABLE.iter().chain(RECOGNISED.iter()) {
+            assert!(is_audio_ext(ext), "{ext} indexed but not recognised as audio");
+        }
+        // The extensions that were actually in the divergence.
+        for ext in ["aiff", "aif", "ape", "wv", "opus"] {
+            assert!(is_audio_ext(ext), "{ext} must be recognised");
+        }
+    }
+
+    /// A format cannot be both — every entry has one answer.
+    #[test]
+    fn no_extension_is_in_both_tables() {
+        for e in PLAYABLE {
+            assert!(!RECOGNISED.contains(e), "{e} is in both tables");
+        }
+    }
+
+    /// Recognised-but-not-playable must carry a reason, or the UI has nothing
+    /// to say when it refuses.
+    #[test]
+    fn every_unplayable_format_can_explain_itself() {
+        for e in RECOGNISED {
+            assert!(unplayable_reason(e).is_some(), "{e} has no reason");
+        }
+        for e in PLAYABLE {
+            assert!(unplayable_reason(e).is_none(), "{e} plays but claims it cannot");
+        }
+    }
+
+    /// WavPack is the dangerous one: the decoder does NOT fail on it, so only
+    /// an extension check keeps NaN out of the mixer.
+    #[test]
+    fn wavpack_is_refused_before_the_decoder_sees_it() {
+        assert!(!is_playable_ext("wv"));
+        assert!(is_audio_ext("wv"));
+        assert_eq!(
+            unplayable_path_reason(Path::new("C:\\m\\a.WV")),
+            Some("WavPack isn't supported yet"),
+            "case must not decide whether audio plays"
+        );
+    }
+
+    #[test]
+    fn case_and_paths() {
+        assert!(is_playable_ext("FLAC"));
+        assert!(is_playable_path(Path::new("C:\\m\\01 - Song.Mp3")));
+        assert!(!is_audio_path(Path::new("C:\\m\\cover.jpg")));
+        assert!(!is_audio_path(Path::new("C:\\m\\noext")));
+    }
+}

crates/library/Cargo.toml

@@ -6,6 +6,7 @@ rust-version.workspace = true
 
 [dependencies]
 rusqlite = { version = "0.32", features = ["bundled"] }
+audio-formats = { path = "../audio-formats" }
 serde.workspace = true
 thiserror.workspace = true
 log.workspace = true

crates/player/Cargo.toml

@@ -5,6 +5,7 @@ edition.workspace = true
 rust-version.workspace = true
 
 [dependencies]
+audio-formats = { path = "../audio-formats" }
 rodio = { version = "0.21", features = ["symphonia-all"] }
 symphonia = { version = "0.5", features = ["all"] }
 thiserror.workspace = true

crates/player/examples/probe_formats.rs

@@ -0,0 +1,187 @@
+//! Ask the REAL decoder what it can open.
+//!
+//! The app carries several hand-maintained lists of "audio extensions", and a
+//! list is a claim, not a capability — the only thing that settles whether a
+//! file plays is building the same decoder the player builds.
+//!
+//!   cargo run -p player --example probe_formats -- <file-or-folder> [more...]
+//!
+//! A folder is walked and one file per extension is probed, which is what makes
+//! this cheap to point at a whole library.
+use std::collections::BTreeMap;
+use std::path::{Path, PathBuf};
+
+fn main() {
+    let args: Vec<String> = std::env::args().skip(1).collect();
+    if args.is_empty() {
+        eprintln!("usage: probe_formats <file-or-folder>...");
+        std::process::exit(2);
+    }
+
+    // One representative per extension: the question is "can this FORMAT be
+    // decoded", and a thousand MP3s answer it no better than one.
+    let mut sample: BTreeMap<String, PathBuf> = BTreeMap::new();
+    let mut counts: BTreeMap<String, usize> = BTreeMap::new();
+    for a in &args {
+        collect(Path::new(a), &mut sample, &mut counts, 0);
+    }
+
+    println!("{:<8} {:>7}  {:<9} {}", "EXT", "FILES", "VERDICT", "DETAIL");
+    for (ext, path) in &sample {
+        let (verdict, detail) = probe(path);
+        println!(
+            "{:<8} {:>7}  {:<9} {}",
+            ext,
+            counts.get(ext).copied().unwrap_or(0),
+            verdict,
+            detail
+        );
+    }
+}
+
+fn collect(
+    p: &Path,
+    sample: &mut BTreeMap<String, PathBuf>,
+    counts: &mut BTreeMap<String, usize>,
+    depth: u8,
+) {
+    if depth > 8 {
+        return;
+    }
+    if p.is_dir() {
+        let Ok(entries) = std::fs::read_dir(p) else { return };
+        for e in entries.flatten() {
+            collect(&e.path(), sample, counts, depth + 1);
+        }
+        return;
+    }
+    let Some(ext) = p.extension().and_then(|e| e.to_str()) else { return };
+    let ext = ext.to_ascii_lowercase();
+    // Anything that is plausibly audio, INCLUDING formats no list mentions —
+    // the point is to discover the gap, not to confirm the lists.
+    const PLAUSIBLE: &[&str] = &[
+        "flac", "mp3", "mp2", "mp1", "m4a", "m4b", "mp4", "aac", "alac", "ogg", "oga", "opus",
+        "wav", "wave", "aiff", "aif", "aifc", "caf", "mka", "webm", "wma", "ape", "wv", "mpc",
+        "tta", "shn", "dsf", "dff", "ra", "au", "amr", "3gp", "spx",
+    ];
+    if !PLAUSIBLE.contains(&ext.as_str()) {
+        return;
+    }
+    *counts.entry(ext.clone()).or_insert(0) += 1;
+    sample.entry(ext).or_insert_with(|| p.to_path_buf());
+}
+
+/// Build exactly what `player` builds for a local file.
+fn probe(path: &Path) -> (&'static str, String) {
+    use rodio::Decoder;
+    let file = match std::fs::File::open(path) {
+        Ok(f) => f,
+        Err(e) => return ("ERROR", format!("open failed: {e}")),
+    };
+    let len = file.metadata().map(|m| m.len()).unwrap_or(0);
+    let reader = std::io::BufReader::new(file);
+    let mut builder = Decoder::builder().with_data(reader).with_seekable(true);
+    if len > 0 {
+        builder = builder.with_byte_len(len);
+    }
+    // What did symphonia actually RECOGNISE? A verdict of "plays" is worth
+    // little if the container was mistaken for something else, so name the
+    // format and codec rather than inferring capability from the extension.
+    let detected = detect(path).unwrap_or_else(|| "?".into());
+    match builder.build() {
+        Ok(d) => {
+            // Opening is not playing. A container can parse while its codec is
+            // missing, and a truncated decode looks like success if you only
+            // pull a few thousand samples — so decode the WHOLE thing and check
+            // the duration against the file. A 30 MB lossless track that yields
+            // two seconds of audio has not been decoded, it has been guessed at.
+            use rodio::Source as _;
+            let rate = d.sample_rate();
+            let ch = d.channels();
+            let mut src = d;
+            // Amplitude tells apart "decoded" from "mis-identified". Compressed
+            // bytes read as raw PCM are full-scale noise: near-100% of samples
+            // land loud, where real music spends most of its time quiet.
+            let (mut n, mut sumsq, mut hot, mut bad) = (0u64, 0f64, 0u64, 0u64);
+            for s in src.by_ref() {
+                let v = s as f64;
+                // A non-finite sample is proof on its own: no decoder emits
+                // NaN from real audio. It comes from compressed bytes being
+                // reinterpreted as floats, and it poisons every mixer and
+                // normaliser stage downstream of here.
+                if !v.is_finite() {
+                    bad += 1;
+                    n += 1;
+                    continue;
+                }
+                sumsq += v * v;
+                if v.abs() > 0.5 {
+                    hot += 1;
+                }
+                n += 1;
+            }
+            let rms = if n > 0 { (sumsq / n as f64).sqrt() } else { 0.0 };
+            let hot_pct = if n > 0 { hot as f64 * 100.0 / n as f64 } else { 0.0 };
+            let frames = n as f64 / (ch.max(1) as f64);
+            let secs = frames / rate.max(1) as f64;
+            let mb = len as f64 / 1_048_576.0;
+            if secs < 1.0 {
+                return ("NO AUDIO", format!("{rate} Hz, {ch}ch — {secs:.2}s from {mb:.1} MB"));
+            }
+            // Even the densest lossless runs well under 10 MB per second.
+            if mb / secs > 10.0 {
+                return (
+                    "PARTIAL",
+                    format!("{rate} Hz, {ch}ch — only {secs:.1}s from {mb:.1} MB"),
+                );
+            }
+            // Half the samples above half scale is not music. This is the
+            // WavPack case: a RIFF header inside the wrapper makes symphonia
+            // read the compressed body as PCM, so it "succeeds" into noise —
+            // which is worse than refusing, because nothing reports an error.
+            if bad > 0 {
+                return (
+                    "GARBAGE",
+                    format!(
+                        "{detected}  mis-identified — {} of {n} samples are NaN/Inf",
+                        bad
+                    ),
+                );
+            }
+            if hot_pct > 40.0 && rms > 0.35 {
+                return (
+                    "NOISE",
+                    format!("{detected}  mis-identified — rms {rms:.2}, {hot_pct:.0}% of samples above half scale"),
+                );
+            }
+            (
+                "PLAYS",
+                format!("{detected}  {rate} Hz, {ch}ch, {secs:.0}s, rms {rms:.2}"),
+            )
+        }
+        Err(e) => ("CANNOT", format!("{detected}  {e}")),
+    }
+}
+
+/// The codec symphonia identifies, straight from the probe — the ground truth
+/// behind a "plays" verdict.
+fn detect(path: &Path) -> Option<String> {
+    use symphonia::core::io::MediaSourceStream;
+    use symphonia::core::probe::Hint;
+    let file = std::fs::File::open(path).ok()?;
+    let mss = MediaSourceStream::new(Box::new(file), Default::default());
+    let mut hint = Hint::new();
+    if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
+        hint.with_extension(ext);
+    }
+    let probed = symphonia::default::get_probe()
+        .format(&hint, mss, &Default::default(), &Default::default())
+        .ok()?;
+    let track = probed.format.default_track()?;
+    let codec = track.codec_params.codec;
+    let name = symphonia::default::get_codecs()
+        .get_codec(codec)
+        .map(|d| d.short_name.to_string())
+        .unwrap_or_else(|| format!("codec:{codec:?}"));
+    Some(name)
+}

crates/player/src/lib.rs

@@ -8,6 +8,7 @@
 
 mod loudness;
 mod source;
+pub mod vocals;
 mod waveform;
 
 pub use loudness::{analyze_loudness, Analysis, AnalysisSource, Incomplete, LoudnessMeter};
@@ -494,6 +495,19 @@ fn start_decoder(
             .into(),
         )
         .spawn(move || {
+            // Refuse formats there is no decoder for, BEFORE opening them.
+            //
+            // Most simply fail to build and report themselves. WavPack does
+            // not: a `.wv` carrying the original RIFF header in its wrapper is
+            // probed as raw PCM, so the decoder reports success and streams the
+            // compressed body as samples — measured at 136,815 NaN/Inf values
+            // in a single track, straight into the mixer and the normaliser.
+            // An extension check is the only thing that can stop that, because
+            // by the time there is a decoder there is no error to notice.
+            if let Some(reason) = audio_formats::unplayable_path_reason(&track.path) {
+                let _ = tx.send(Err((generation, reason.to_string())));
+                return;
+            }
             let (reader, byte_len): (Box<dyn source::MediaRead>, u64) = match track.stream.clone() {
                 Some(progress) => {
                     match GrowingFile::open(&track.path, track.total_bytes, progress) {

crates/player/src/vocals.rs

@@ -0,0 +1,512 @@
+//! Vocal-band DSP for the lyrics feature: a leading-silence probe (auto-sync
+//! evidence) and an offline vocal-reduction renderer (the classic band-limited
+//! center-cancel, NOT a learned separator — honest about what it is).
+//!
+//! Everything here is offline file work. Nothing touches the live audio
+//! engine: the renderer writes an ordinary WAV that plays through the normal
+//! local-file path, so a bug in this module can never destabilize playback.
+
+use std::io::Write as _;
+use std::path::Path;
+
+use symphonia::core::audio::SampleBuffer;
+use symphonia::core::codecs::DecoderOptions;
+use symphonia::core::formats::FormatOptions;
+use symphonia::core::io::MediaSourceStream;
+use symphonia::core::meta::MetadataOptions;
+use symphonia::core::probe::Hint;
+
+/// Longest source the renderer accepts. A WAV render holds the whole track
+/// in memory (16-bit stereo ≈ 10.6 MB/min at 44.1k); twenty minutes bounds
+/// that at ~212 MB and excludes accidental full-set files.
+const MAX_RENDER_SECS: f64 = 20.0 * 60.0;
+
+/// RMS floor treated as "audible": −50 dBFS, sustained. Modern releases sit
+/// far above this; dithered lead-in noise sits below it.
+const SILENCE_RMS: f32 = 0.003_16;
+/// Frame size for the silence scan (about 20 ms at 44.1 kHz).
+const SILENCE_FRAME: usize = 1024;
+/// How many consecutive audible frames end the silence (~60 ms) — a single
+/// vinyl tick or DC blip must not count as the music starting.
+const SILENCE_RUN: usize = 3;
+/// The silence probe never reads past this point; a track that has not
+/// started within thirty seconds is not a case auto-sync should judge.
+const SILENCE_SCAN_SECS: f64 = 30.0;
+
+// ---- decoding --------------------------------------------------------------
+
+struct Decoded {
+    /// Interleaved f32 frames.
+    samples: Vec<f32>,
+    channels: usize,
+    sample_rate: u32,
+}
+
+/// Decode `path` fully (or up to `limit_secs`) into interleaved f32.
+fn decode(path: &Path, limit_secs: Option<f64>) -> Result<Decoded, String> {
+    let file = std::fs::File::open(path).map_err(|e| e.to_string())?;
+    let mss = MediaSourceStream::new(Box::new(file), Default::default());
+    let mut hint = Hint::new();
+    if let Some(ext) = path.extension().and_then(|e| e.to_str()) {
+        hint.with_extension(ext);
+    }
+    let probed = symphonia::default::get_probe()
+        .format(
+            &hint,
+            mss,
+            &FormatOptions::default(),
+            &MetadataOptions::default(),
+        )
+        .map_err(|e| e.to_string())?;
+    let mut format = probed.format;
+    let track = format
+        .default_track()
+        .ok_or("no default audio track")?
+        .clone();
+    let mut decoder = symphonia::default::get_codecs()
+        .make(&track.codec_params, &DecoderOptions::default())
+        .map_err(|e| e.to_string())?;
+
+    let mut samples = Vec::new();
+    let mut channels = 0usize;
+    let mut sample_rate = 0u32;
+    let mut buffer: Option<SampleBuffer<f32>> = None;
+    loop {
+        let packet = match format.next_packet() {
+            Ok(p) => p,
+            Err(symphonia::core::errors::Error::IoError(_)) => break,
+            Err(symphonia::core::errors::Error::ResetRequired) => break,
+            Err(_) => break,
+        };
+        if packet.track_id() != track.id {
+            continue;
+        }
+        let decoded = match decoder.decode(&packet) {
+            Ok(d) => d,
+            Err(symphonia::core::errors::Error::DecodeError(_)) => continue,
+            Err(_) => break,
+        };
+        let spec = *decoded.spec();
+        channels = spec.channels.count();
+        sample_rate = spec.rate;
+        let out = buffer.get_or_insert_with(|| {
+            SampleBuffer::<f32>::new(decoded.capacity() as u64, spec)
+        });
+        if out.capacity() < decoded.capacity() * channels {
+            *out = SampleBuffer::<f32>::new(decoded.capacity() as u64, spec);
+        }
+        out.copy_interleaved_ref(decoded);
+        samples.extend_from_slice(out.samples());
+        if let Some(limit) = limit_secs {
+            if sample_rate > 0
+                && (samples.len() / channels.max(1)) as f64 / sample_rate as f64 >= limit
+            {
+                break;
+            }
+        }
+    }
+    if samples.is_empty() || channels == 0 || sample_rate == 0 {
+        return Err("nothing decodable".into());
+    }
+    Ok(Decoded {
+        samples,
+        channels,
+        sample_rate,
+    })
+}
+
+// ---- leading silence -------------------------------------------------------
+
+/// Milliseconds of leading silence in `path`, or None when the file cannot be
+/// decoded / never becomes audible inside the scan window.
+pub fn leading_silence_ms(path: &Path) -> Option<u64> {
+    let decoded = decode(path, Some(SILENCE_SCAN_SECS)).ok()?;
+    let frames_rms = fold_rms(&decoded.samples, decoded.channels, SILENCE_FRAME);
+    let onset_frame = onset_from_rms(&frames_rms)?;
+    Some(
+        (onset_frame as u64 * SILENCE_FRAME as u64 * 1000)
+            / decoded.sample_rate.max(1) as u64,
+    )
+}
+
+/// Interleaved samples → per-frame mono RMS.
+fn fold_rms(samples: &[f32], channels: usize, frame: usize) -> Vec<f32> {
+    let channels = channels.max(1);
+    let per_frame = frame * channels;
+    samples
+        .chunks(per_frame)
+        .map(|chunk| {
+            let sum: f32 = chunk.iter().map(|s| s * s).sum();
+            (sum / chunk.len().max(1) as f32).sqrt()
+        })
+        .collect()
+}
+
+/// First frame index beginning [`SILENCE_RUN`] consecutive audible frames.
+fn onset_from_rms(rms: &[f32]) -> Option<usize> {
+    let mut run = 0usize;
+    for (index, &value) in rms.iter().enumerate() {
+        if value > SILENCE_RMS {
+            run += 1;
+            if run >= SILENCE_RUN {
+                return Some(index + 1 - run);
+            }
+        } else {
+            run = 0;
+        }
+    }
+    None
+}
+
+// ---- vocal activity --------------------------------------------------------
+
+/// A coarse "is someone likely singing here" envelope: the energy of the
+/// CENTER (mid) channel band-passed to the vocal range, one value per
+/// `frame_ms`, normalized 0..1 against its own loud end. The same physics
+/// the vocal reducer exploits — center-mixed vocals dominate the mid band —
+/// read instead of removed. A proxy, not a detector: instruments living
+/// center-mid (lead guitar, synth hooks) light it up too, which is why the
+/// rough-sync generator that consumes it is labeled ESTIMATED and hands the
+/// result to the correction editor rather than presenting it as truth.
+pub struct VocalActivity {
+    pub frame_ms: u32,
+    /// 0..1 per frame.
+    pub frames: Vec<f32>,
+}
+
+pub fn vocal_activity(path: &Path, frame_ms: u32) -> Result<VocalActivity, String> {
+    let decoded = decode(path, Some(MAX_RENDER_SECS + 2.0))?;
+    let frame_ms = frame_ms.clamp(40, 500);
+    let frame_len = (decoded.sample_rate as usize * frame_ms as usize) / 1000;
+    let channels = decoded.channels;
+    let mut low = Biquad::highpass(decoded.sample_rate as f32, 180.0);
+    let mut high = Biquad::lowpass(decoded.sample_rate as f32, 7_500.0);
+    let mut frames = Vec::new();
+    let mut acc = 0.0f64;
+    let mut n = 0usize;
+    for frame in decoded.samples.chunks(channels) {
+        let mid = if channels >= 2 {
+            0.5 * (frame[0] + frame[1])
+        } else {
+            frame[0]
+        };
+        let banded = high.process(low.process(mid));
+        acc += (banded * banded) as f64;
+        n += 1;
+        if n >= frame_len {
+            frames.push((acc / n as f64).sqrt() as f32);
+            acc = 0.0;
+            n = 0;
+        }
+    }
+    if n > frame_len / 4 {
+        frames.push((acc / n.max(1) as f64).sqrt() as f32);
+    }
+    if frames.is_empty() {
+        return Err("nothing decodable".into());
+    }
+    // Normalize against the loud end (95th percentile), so one hot chorus
+    // does not flatten the whole song to zero.
+    let mut sorted: Vec<f32> = frames.clone();
+    sorted.sort_by(|a, b| a.partial_cmp(b).unwrap_or(std::cmp::Ordering::Equal));
+    let p95 = sorted[(sorted.len() * 95 / 100).min(sorted.len() - 1)].max(1e-6);
+    for value in &mut frames {
+        *value = (*value / p95).min(1.0);
+    }
+    Ok(VocalActivity { frame_ms, frames })
+}
+
+// ---- vocal reduction -------------------------------------------------------
+
+/// What the renderer produced (for the caller's labels and sanity checks).
+pub struct VocalReduction {
+    pub duration_secs: f64,
+    pub sample_rate: u32,
+}
+
+/// Render a vocal-reduced copy of `src` to `dest_wav` (16-bit stereo WAV).
+///
+/// The method is the classic out-of-phase cancellation with band limiting:
+/// the center (mid) channel is removed in the vocal band while the lows
+/// (bass, kick) and the highest air band are kept, and the side content
+/// passes through untouched. It works in proportion to how center-mixed the
+/// lead vocal is — modern wide/reverbed vocals survive partially. That limit
+/// is inherent to the technique; the honest fix is the future learned
+/// separator the research bundle scopes.
+pub fn render_vocal_reduced(src: &Path, dest_wav: &Path) -> Result<VocalReduction, String> {
+    // The decode itself stops just past the cap, so an accidental multi-hour
+    // file cannot balloon memory before the refusal fires.
+    let decoded = decode(src, Some(MAX_RENDER_SECS + 2.0))?;
+    if decoded.channels < 2 {
+        return Err("This recording is mono — there is no center channel to cancel".into());
+    }
+    let frames = decoded.samples.len() / decoded.channels;
+    let duration = frames as f64 / decoded.sample_rate as f64;
+    if duration > MAX_RENDER_SECS {
+        return Err("Track is too long for the instrumental renderer (20 min cap)".into());
+    }
+    // First two channels carry the stereo image; extra channels are dropped.
+    let mut stereo: Vec<f32> = Vec::with_capacity(frames * 2);
+    for frame in decoded.samples.chunks(decoded.channels) {
+        stereo.push(frame[0]);
+        stereo.push(frame[1]);
+    }
+    process_center_cancel(&mut stereo, decoded.sample_rate);
+    write_wav_16(dest_wav, &stereo, decoded.sample_rate)?;
+    Ok(VocalReduction {
+        duration_secs: duration,
+        sample_rate: decoded.sample_rate,
+    })
+}
+
+/// In-place band-limited center cancellation over interleaved stereo.
+///
+/// out_L = side + LP(mid) + HP(mid); out_R = −side + LP(mid) + HP(mid) —
+/// removing the mid band where vocals live (~180 Hz–7.5 kHz) and keeping the
+/// side image, the lows, and the air.
+fn process_center_cancel(stereo: &mut [f32], sample_rate: u32) {
+    let mut low = Biquad::lowpass(sample_rate as f32, 180.0);
+    let mut high = Biquad::highpass(sample_rate as f32, 7_500.0);
+    let keep_air = sample_rate >= 22_050;
+    for frame in stereo.chunks_mut(2) {
+        let (l, r) = (frame[0], frame[1]);
+        let mid = 0.5 * (l + r);
+        let side = 0.5 * (l - r);
+        let lows = low.process(mid);
+        let air = if keep_air { high.process(mid) } else { 0.0 };
+        let kept = lows + air;
+        frame[0] = ((side + kept) * 0.95).clamp(-1.0, 1.0);
+        frame[1] = ((kept - side) * 0.95).clamp(-1.0, 1.0);
+    }
+}
+
+/// RBJ-cookbook biquad, Butterworth Q.
+struct Biquad {
+    b0: f32,
+    b1: f32,
+    b2: f32,
+    a1: f32,
+    a2: f32,
+    x1: f32,
+    x2: f32,
+    y1: f32,
+    y2: f32,
+}
+
+impl Biquad {
+    fn new(b0: f32, b1: f32, b2: f32, a0: f32, a1: f32, a2: f32) -> Biquad {
+        Biquad {
+            b0: b0 / a0,
+            b1: b1 / a0,
+            b2: b2 / a0,
+            a1: a1 / a0,
+            a2: a2 / a0,
+            x1: 0.0,
+            x2: 0.0,
+            y1: 0.0,
+            y2: 0.0,
+        }
+    }
+    fn lowpass(sample_rate: f32, fc: f32) -> Biquad {
+        let w = 2.0 * std::f32::consts::PI * fc / sample_rate;
+        // Butterworth: alpha = sin(w)/(2·Q) with Q = 1/√2.
+        let alpha = w.sin() * std::f32::consts::FRAC_1_SQRT_2;
+        let c = w.cos();
+        Biquad::new(
+            (1.0 - c) / 2.0,
+            1.0 - c,
+            (1.0 - c) / 2.0,
+            1.0 + alpha,
+            -2.0 * c,
+            1.0 - alpha,
+        )
+    }
+    fn highpass(sample_rate: f32, fc: f32) -> Biquad {
+        let w = 2.0 * std::f32::consts::PI * fc / sample_rate;
+        let alpha = w.sin() * std::f32::consts::FRAC_1_SQRT_2;
+        let c = w.cos();
+        Biquad::new(
+            (1.0 + c) / 2.0,
+            -(1.0 + c),
+            (1.0 + c) / 2.0,
+            1.0 + alpha,
+            -2.0 * c,
+            1.0 - alpha,
+        )
+    }
+    fn process(&mut self, x: f32) -> f32 {
+        let y = self.b0 * x + self.b1 * self.x1 + self.b2 * self.x2
+            - self.a1 * self.y1
+            - self.a2 * self.y2;
+        self.x2 = self.x1;
+        self.x1 = x;
+        self.y2 = self.y1;
+        self.y1 = y;
+        y
+    }
+}
+
+/// Minimal 16-bit PCM stereo WAV writer (44-byte canonical header).
+fn write_wav_16(dest: &Path, interleaved: &[f32], sample_rate: u32) -> Result<(), String> {
+    let data_len = (interleaved.len() * 2) as u32;
+    let mut out = std::io::BufWriter::new(
+        std::fs::File::create(dest).map_err(|e| e.to_string())?,
+    );
+    let byte_rate = sample_rate * 2 * 2;
+    let mut header = Vec::with_capacity(44);
+    header.extend_from_slice(b"RIFF");
+    header.extend_from_slice(&(36 + data_len).to_le_bytes());
+    header.extend_from_slice(b"WAVEfmt ");
+    header.extend_from_slice(&16u32.to_le_bytes());
+    header.extend_from_slice(&1u16.to_le_bytes()); // PCM
+    header.extend_from_slice(&2u16.to_le_bytes()); // stereo
+    header.extend_from_slice(&sample_rate.to_le_bytes());
+    header.extend_from_slice(&byte_rate.to_le_bytes());
+    header.extend_from_slice(&4u16.to_le_bytes()); // block align
+    header.extend_from_slice(&16u16.to_le_bytes()); // bits
+    header.extend_from_slice(b"data");
+    header.extend_from_slice(&data_len.to_le_bytes());
+    out.write_all(&header).map_err(|e| e.to_string())?;
+    let mut bytes = Vec::with_capacity(interleaved.len() * 2);
+    for &sample in interleaved {
+        bytes.extend_from_slice(&((sample.clamp(-1.0, 1.0) * 32767.0) as i16).to_le_bytes());
+    }
+    out.write_all(&bytes).map_err(|e| e.to_string())?;
+    out.flush().map_err(|e| e.to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn rms(stereo: &[f32]) -> f32 {
+        (stereo.iter().map(|s| s * s).sum::<f32>() / stereo.len() as f32).sqrt()
+    }
+
+    fn sine_stereo(freq: f32, secs: f32, rate: u32, pan: &str) -> Vec<f32> {
+        let frames = (secs * rate as f32) as usize;
+        let mut out = Vec::with_capacity(frames * 2);
+        for i in 0..frames {
+            let s = (2.0 * std::f32::consts::PI * freq * i as f32 / rate as f32).sin() * 0.5;
+            match pan {
+                "center" => {
+                    out.push(s);
+                    out.push(s);
+                }
+                "left" => {
+                    out.push(s);
+                    out.push(0.0);
+                }
+                // Anti-phase: pure side content.
+                _ => {
+                    out.push(s);
+                    out.push(-s);
+                }
+            }
+        }
+        out
+    }
+
+    /// The whole point: a center-panned vocal-band tone dies, a center bass
+    /// tone survives, side content survives.
+    #[test]
+    fn center_vocal_band_is_cancelled_lows_and_sides_survive() {
+        let rate = 44_100;
+        let mut vocal = sine_stereo(1_000.0, 0.5, rate, "center");
+        let before = rms(&vocal);
+        process_center_cancel(&mut vocal, rate);
+        assert!(
+            rms(&vocal) < before * 0.06,
+            "center 1kHz must drop >24dB, got {} → {}",
+            before,
+            rms(&vocal)
+        );
+
+        let mut bass = sine_stereo(60.0, 0.5, rate, "center");
+        let bass_before = rms(&bass);
+        process_center_cancel(&mut bass, rate);
+        assert!(
+            rms(&bass) > bass_before * 0.6,
+            "center 60Hz must survive the low-band keep, got {} → {}",
+            bass_before,
+            rms(&bass)
+        );
+
+        let mut side = sine_stereo(1_000.0, 0.5, rate, "side");
+        let side_before = rms(&side);
+        process_center_cancel(&mut side, rate);
+        assert!(
+            rms(&side) > side_before * 0.7,
+            "side content must pass through, got {} → {}",
+            side_before,
+            rms(&side)
+        );
+    }
+
+    #[test]
+    fn onset_ignores_a_lone_tick() {
+        // 40 silent frames, one loud blip, more silence, then real audio.
+        let mut frames = vec![0.0005f32; 40];
+        frames[10] = 0.2; // vinyl tick — one frame only
+        frames.extend(vec![0.1f32; 20]);
+        assert_eq!(onset_from_rms(&frames), Some(40));
+        assert_eq!(onset_from_rms(&[0.0001f32; 50]), None, "never audible");
+    }
+
+    /// End-to-end through the WAV writer and back through symphonia: the
+    /// rendered file decodes, keeps the length, and is quieter in the mid.
+    #[test]
+    fn renders_a_playable_wav() {
+        let dir = std::env::temp_dir().join("ssplus-vocals-test");
+        std::fs::create_dir_all(&dir).unwrap();
+        let src = dir.join("src.wav");
+        let dest = dir.join("out.wav");
+        let rate = 44_100u32;
+        // A "song": center 1kHz vocal + left-panned 3kHz guitar.
+        let mut mix = sine_stereo(1_000.0, 1.0, rate, "center");
+        let guitar = sine_stereo(3_000.0, 1.0, rate, "left");
+        for (m, g) in mix.iter_mut().zip(guitar.iter()) {
+            *m = (*m + g).clamp(-1.0, 1.0);
+        }
+        write_wav_16(&src, &mix, rate).unwrap();
+
+        let result = render_vocal_reduced(&src, &dest).unwrap();
+        assert_eq!(result.sample_rate, rate);
+        assert!((result.duration_secs - 1.0).abs() < 0.05);
+
+        let back = decode(&dest, None).unwrap();
+        assert_eq!(back.channels, 2);
+        let frames = back.samples.len() / 2;
+        assert!((frames as f64 / rate as f64 - 1.0).abs() < 0.05);
+
+        // Mono files are refused, not mangled.
+        let mono = dir.join("mono.wav");
+        {
+            use std::io::Write as _;
+            let samples: Vec<f32> = sine_stereo(440.0, 0.2, rate, "center")
+                .chunks(2)
+                .map(|c| c[0])
+                .collect();
+            let data_len = (samples.len() * 2) as u32;
+            let mut out = std::fs::File::create(&mono).unwrap();
+            let mut header = Vec::new();
+            header.extend_from_slice(b"RIFF");
+            header.extend_from_slice(&(36 + data_len).to_le_bytes());
+            header.extend_from_slice(b"WAVEfmt ");
+            header.extend_from_slice(&16u32.to_le_bytes());
+            header.extend_from_slice(&1u16.to_le_bytes());
+            header.extend_from_slice(&1u16.to_le_bytes());
+            header.extend_from_slice(&rate.to_le_bytes());
+            header.extend_from_slice(&(rate * 2).to_le_bytes());
+            header.extend_from_slice(&2u16.to_le_bytes());
+            header.extend_from_slice(&16u16.to_le_bytes());
+            header.extend_from_slice(b"data");
+            header.extend_from_slice(&data_len.to_le_bytes());
+            out.write_all(&header).unwrap();
+            for s in &samples {
+                out.write_all(&((s * 32767.0) as i16).to_le_bytes()).unwrap();
+            }
+        }
+        assert!(render_vocal_reduced(&mono, &dest).is_err());
+    }
+}

crates/soulseek-client/Cargo.toml

@@ -6,6 +6,7 @@ rust-version.workspace = true
 
 [dependencies]
 soulseek-proto = { path = "../soulseek-proto" }
+audio-formats = { path = "../audio-formats" }
 tokio.workspace = true
 tokio-util = "0.7"
 bytes.workspace = true

crates/soulseek-client/src/distributed.rs

@@ -93,8 +93,11 @@ async fn run_parent(inner: &Arc<Inner>, mut stream: TcpStream) -> std::io::Resul
                 responder::respond_to_search(inner.clone(), username, token, query);
             }
             Ok(dist::DistributedEvent::BranchLevel(level)) => {
-                // Report our level (parent + 1) to the server.
-                let _ = inner.send_server(server::branch_level(level + 1));
+                // Report our level (parent + 1) to the server. Saturating: the
+                // level is a peer-supplied u32, and one parent really did send
+                // a value at the top of the range — `+ 1` panicked this worker
+                // (debug overflow checks) mid-session on 2026-08-14.
+                let _ = inner.send_server(server::branch_level(level.saturating_add(1)));
             }
             Ok(dist::DistributedEvent::BranchRoot(root)) => {
                 let _ = inner.send_server(server::branch_root(&root));

crates/soulseek-client/src/share.rs

@@ -11,9 +11,10 @@ use std::sync::RwLock;
 
 use soulseek_proto::types::{Directory, File};
 
-const AUDIO_EXTS: [&str; 10] = [
-    "flac", "mp3", "m4a", "ogg", "opus", "wav", "aac", "wma", "ape", "aiff",
-];
+// Shared with the library scanner and the row pruner (`audio-formats`). The
+// share index deliberately offers formats this app cannot itself PLAY — a peer
+// asking for `.ape` is well served by a file we hold, and refusing to share it
+// helps nobody.
 
 /// One shared file: its remote (virtual) path and where it lives locally.
 #[derive(Debug, Clone)]
@@ -161,8 +162,14 @@ fn walk(dir: &Path, base: &str, root: &Path, index: &mut Index) {
         let path = entry.path();
         if path.is_dir() {
             // The download staging pen is not part of anyone's library —
-            // half-finished transfers are not shareable records.
-            if path.file_name().is_some_and(|n| n == "(Cache)") {
+            // half-finished transfers are not shareable records. `.soulstream`
+            // holds the library's own database, review session and artwork
+            // cache; only audio is ever indexed, so it could not be served
+            // anyway, but it has no business appearing in a browse listing.
+            if path
+                .file_name()
+                .is_some_and(|n| n == "(Cache)" || n == ".soulstream")
+            {
                 continue;
             }
             walk(&path, base, root, index);
@@ -203,10 +210,7 @@ fn to_remote_path(path: &Path, base: &str, root: &Path) -> String {
 }
 
 fn is_audio(path: &Path) -> bool {
-    path.extension()
-        .and_then(|e| e.to_str())
-        .map(|e| AUDIO_EXTS.contains(&e.to_ascii_lowercase().as_str()))
-        .unwrap_or(false)
+    audio_formats::is_audio_path(path)
 }
 
 #[cfg(test)]

crates/tagger/src/lib.rs

@@ -26,6 +26,10 @@ pub struct TagSummary {
     pub album: Option<String>,
     pub title: Option<String>,
     pub track_no: Option<u32>,
+    /// Which disc of the release, 1-based, when the file says so. Every disc
+    /// numbers its tracks from 1, so without this a two-disc rip reads as two
+    /// track 1s, two track 2s, and so on down the album.
+    pub disc_no: Option<u32>,
     pub year: Option<u32>,
     pub duration_secs: Option<u32>,
     pub bitrate_kbps: Option<u32>,
@@ -50,6 +54,7 @@ pub fn read_summary(path: &Path) -> Result<TagSummary> {
         summary.album = non_empty(tag.album().as_deref());
         summary.title = non_empty(tag.title().as_deref());
         summary.track_no = tag.track();
+        summary.disc_no = tag.disk();
         summary.year = tag.year();
         summary.album_artist = non_empty(
             tag.get_string(&lofty::tag::ItemKey::AlbumArtist)
@@ -69,6 +74,10 @@ pub struct TagWrite {
     pub album: Option<String>,
     pub title: Option<String>,
     pub track_no: Option<u32>,
+    /// Written into the file, not just the database: a release joined from
+    /// disc folders loses that structure the moment it is filed flat, and the
+    /// tag is the only place the answer survives being read by anything else.
+    pub disc_no: Option<u32>,
     pub year: Option<u32>,
     pub label: Option<String>,
     pub genre: Option<String>,
@@ -109,6 +118,7 @@ pub fn write_tags(
         || write.album.is_some()
         || write.title.is_some()
         || write.track_no.is_some()
+        || write.disc_no.is_some()
         || write.year.is_some()
         || write.label.is_some()
         || write.genre.is_some();
@@ -147,6 +157,9 @@ pub fn write_tags(
     if let Some(v) = write.track_no {
         tag.set_track(v);
     }
+    if let Some(v) = write.disc_no {
+        tag.set_disk(v);
+    }
     if let Some(v) = write.year {
         tag.set_year(v);
     }
@@ -222,6 +235,104 @@ pub fn replace_art(path: &Path, art_jpeg: &[u8]) -> Result<()> {
     Ok(())
 }
 
+/// Lyrics carried inside the audio file itself.
+#[derive(Debug, Clone, Default)]
+pub struct EmbeddedLyrics {
+    /// Unsynchronized text (ID3 USLT or the generic LYRICS field).
+    pub plain: Option<String>,
+    /// Synchronized lines from an ID3v2 SYLT frame, (milliseconds, text),
+    /// sorted by time. Empty when the file has none.
+    pub synced: Vec<(u32, String)>,
+}
+
+/// Read embedded lyrics. The plain field comes from the generic tag on every
+/// format lofty knows; SYLT lives only in ID3v2, which lofty exposes as a
+/// binary frame on the concrete MPEG file type, so that pass is MP3-only.
+pub fn read_lyrics(path: &Path) -> Result<EmbeddedLyrics> {
+    use lofty::id3::v2::{Frame, SynchronizedTextFrame, TimestampFormat};
+    use lofty::prelude::*;
+
+    let mut out = EmbeddedLyrics::default();
+    let tagged = Probe::open(path)?.read()?;
+    if let Some(tag) = tagged.primary_tag().or_else(|| tagged.first_tag()) {
+        out.plain = non_empty(
+            tag.get_string(&lofty::tag::ItemKey::Lyrics)
+                .map(|s| s.to_string())
+                .as_deref(),
+        );
+    }
+
+    let is_mp3 = path
+        .extension()
+        .and_then(|e| e.to_str())
+        .is_some_and(|e| e.eq_ignore_ascii_case("mp3"));
+    if is_mp3 {
+        if let Ok(mut file) = std::fs::File::open(path) {
+            if let Ok(mpeg) = lofty::mpeg::MpegFile::read_from(
+                &mut file,
+                lofty::config::ParseOptions::new(),
+            ) {
+                if let Some(id3) = mpeg.id3v2() {
+                    for frame in id3 {
+                        let Frame::Binary(binary) = frame else { continue };
+                        if frame.id().as_str() != "SYLT" {
+                            continue;
+                        }
+                        let Ok(sylt) = SynchronizedTextFrame::parse(
+                            &binary.data,
+                            lofty::id3::v2::FrameFlags::default(),
+                        ) else {
+                            continue;
+                        };
+                        // MPEG-frame-counted timestamps cannot be turned into
+                        // time without decoding; only millisecond SYLT is usable.
+                        if sylt.timestamp_format != TimestampFormat::MS {
+                            continue;
+                        }
+                        let mut lines: Vec<(u32, String)> = sylt
+                            .content
+                            .into_iter()
+                            .map(|(ms, text)| (ms, text.trim().to_string()))
+                            .collect();
+                        lines.sort_by_key(|(ms, _)| *ms);
+                        if lines.iter().any(|(_, t)| !t.is_empty()) {
+                            out.synced = lines;
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+    }
+    Ok(out)
+}
+
+/// The file's own ISRC tag, normalized to the bare 12-character form
+/// (CC-XXX-YY-NNNNN with the dashes people sometimes write stripped), or
+/// None when absent or malformed. An ISRC names the exact RECORDING, which
+/// makes it the one tag strong enough to match against external catalogs
+/// without touching names.
+pub fn read_isrc(path: &Path) -> Result<Option<String>> {
+    let tagged = Probe::open(path)?.read()?;
+    let Some(tag) = tagged.primary_tag().or_else(|| tagged.first_tag()) else {
+        return Ok(None);
+    };
+    let raw = tag
+        .get_string(&lofty::tag::ItemKey::Isrc)
+        .map(|s| s.to_string());
+    Ok(raw.and_then(|s| {
+        let normalized: String = s
+            .chars()
+            .filter(|c| c.is_ascii_alphanumeric())
+            .map(|c| c.to_ascii_uppercase())
+            .collect();
+        let shaped = normalized.len() == 12
+            && normalized.chars().take(2).all(|c| c.is_ascii_alphabetic())
+            && normalized.chars().skip(5).all(|c| c.is_ascii_digit());
+        shaped.then_some(normalized)
+    }))
+}
+
 fn non_empty(s: Option<&str>) -> Option<String> {
     s.map(str::trim).filter(|s| !s.is_empty()).map(String::from)
 }

package.json

@@ -7,7 +7,7 @@
     "dev": "vite",
     "build": "vite build",
     "tauri": "tauri",
-    "test": "node --test tests/preview/*.test.mjs"
+    "test": "node --test tests/preview/"
   },
   "license": "ISC",
   "devDependencies": {

src-tauri/Cargo.toml

@@ -29,6 +29,11 @@ image.workspace = true
 tokio.workspace = true
 
 base64 = "0.22"
+# XSPF playlist import (playlist_formats.rs). quick-xml never resolves DTDs
+# or external entities, which is exactly the safety posture the importer wants.
+quick-xml = "0.37"
+# LRCLIB lyrics client (lyrics.rs). Already in the tree via the metadata crate.
+reqwest = { version = "0.12", features = ["json"] }
 keyring = { version = "3", features = ["windows-native"] }
 sysinfo = "0.33"
 soulseek-proto = { path = "../crates/soulseek-proto" }
@@ -37,6 +42,7 @@ player = { path = "../crates/player" }
 tagger = { path = "../crates/tagger" }
 metadata = { path = "../crates/metadata" }
 library = { path = "../crates/library" }
+audio-formats = { path = "../crates/audio-formats" }
 
 [target.'cfg(windows)'.dependencies]
 windows = { version = "0.61.3", features = [

src-tauri/src/commands.rs

@@ -143,6 +143,9 @@ pub async fn set_settings(
     volume_normalization: Option<bool>,
 ) -> Result<(), String> {
     let mut cfg = config::load(&app);
+    let library_folder_moved = download_dir
+        .as_deref()
+        .is_some_and(|d| Some(d) != cfg.download_dir.as_deref());
     if let Some(d) = download_dir {
         cfg.download_dir = Some(d);
     }
@@ -208,6 +211,25 @@ pub async fn set_settings(
     }
     config::save(&app, &cfg);
 
+    // A new library folder is a new library. Re-base immediately rather than
+    // at the next launch, so what the shelves show is what the folder holds —
+    // the old behaviour left the previous folder's albums standing forever,
+    // and emptying the new folder could not remove them.
+    if library_folder_moved {
+        let app2 = app.clone();
+        let root = config::download_dir(&app, &cfg);
+        tauri::async_runtime::spawn(async move {
+            let lib = app2.state::<crate::pipeline::LibraryState>().library.clone();
+            if let Ok(Ok(dropped)) =
+                tauri::async_runtime::spawn_blocking(move || lib.prune_outside_root(&root)).await
+            {
+                log::info!("library folder changed: dropped {dropped} tracks from the old folder");
+            }
+            let _ = crate::pipeline::rescan_library(app2.clone()).await;
+            let _ = app2.emit("soulseek:library-changed", ());
+        });
+    }
+
     // Tighter limits take effect right away, not at the next stream/startup.
     if retention_changed {
         let app2 = app.clone();
@@ -1263,10 +1285,13 @@ pub struct CatalogHeroPreviewResult {
 const CATALOG_HERO_GPU_MAGIC: &[u8; 4] = b"SHG1";
 const CATALOG_HERO_GPU_HEADER_BYTES: usize = 16;
 
+/// The CHOSEN hero per artist — a decision about this library, not a render
+/// cache — so it travels with the library. (The upscaled results keyed by URL
+/// and recipe stay in the machine's cache dir: they regenerate cheaply and
+/// would otherwise put gigabytes of derived pixels on the drive.)
 fn artist_hero_dir(app: &tauri::AppHandle) -> Result<std::path::PathBuf, String> {
-    let dir = app
-        .path()
-        .app_data_dir()
+    let cfg = config::load(app);
+    let dir = config::ensure_library_data_dir(app, &cfg)
         .map_err(|e| e.to_string())?
         .join("artist-heroes");
     std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
@@ -4366,7 +4391,7 @@ pub async fn home_warm(app: tauri::AppHandle, lib: State<'_, LibraryState>) -> R
     Ok(())
 }
 
-// ---- playlists ----
+// ---- playlists live in src-tauri/src/playlists.rs ----
 
 fn now_secs() -> i64 {
     std::time::SystemTime::now()
@@ -4375,111 +4400,6 @@ fn now_secs() -> i64 {
         .unwrap_or(0)
 }
 
-#[tauri::command]
-pub async fn list_playlists(
-    lib: State<'_, LibraryState>,
-) -> Result<Vec<library::Playlist>, String> {
-    let l = lib.library.clone();
-    tauri::async_runtime::spawn_blocking(move || l.list_playlists().map_err(|e| e.to_string()))
-        .await
-        .map_err(|e| e.to_string())?
-}
-
-#[tauri::command]
-pub async fn create_playlist(
-    app: tauri::AppHandle,
-    lib: State<'_, LibraryState>,
-    name: String,
-) -> Result<i64, String> {
-    let l = lib.library.clone();
-    let id = tauri::async_runtime::spawn_blocking(move || l.create_playlist(&name, now_secs()))
-        .await
-        .map_err(|e| e.to_string())?
-        .map_err(|e| e.to_string())?;
-    let _ = app.emit("soulseek:playlists-changed", ());
-    Ok(id)
-}
-
-#[tauri::command]
-pub async fn delete_playlist(
-    app: tauri::AppHandle,
-    lib: State<'_, LibraryState>,
-    id: i64,
-) -> Result<(), String> {
-    let l = lib.library.clone();
-    tauri::async_runtime::spawn_blocking(move || l.delete_playlist(id))
-        .await
-        .map_err(|e| e.to_string())?
-        .map_err(|e| e.to_string())?;
-    let _ = app.emit("soulseek:playlists-changed", ());
-    Ok(())
-}
-
-#[tauri::command]
-pub async fn playlist_tracks(
-    lib: State<'_, LibraryState>,
-    id: i64,
-) -> Result<Vec<library::PlaylistTrack>, String> {
-    let l = lib.library.clone();
-    tauri::async_runtime::spawn_blocking(move || l.playlist_tracks(id).map_err(|e| e.to_string()))
-        .await
-        .map_err(|e| e.to_string())?
-}
-
-#[derive(serde::Deserialize)]
-pub struct TrackInput {
-    pub title: String,
-    pub artist: String,
-    pub duration_secs: Option<u32>,
-    pub path: String,
-    pub art_path: Option<String>,
-}
-
-#[tauri::command]
-pub async fn add_to_playlist(
-    app: tauri::AppHandle,
-    lib: State<'_, LibraryState>,
-    playlist_id: i64,
-    tracks: Vec<TrackInput>,
-) -> Result<(), String> {
-    let l = lib.library.clone();
-    tauri::async_runtime::spawn_blocking(move || -> library::Result<()> {
-        for t in tracks {
-            l.add_to_playlist(
-                playlist_id,
-                &library::PlaylistTrack {
-                    position: 0, // assigned by insert
-                    title: t.title,
-                    artist: t.artist,
-                    duration_secs: t.duration_secs,
-                    path: t.path,
-                    art_path: t.art_path,
-                },
-            )?;
-        }
-        Ok(())
-    })
-    .await
-    .map_err(|e| e.to_string())?
-    .map_err(|e| e.to_string())?;
-    let _ = app.emit("soulseek:playlists-changed", ());
-    Ok(())
-}
-
-#[tauri::command]
-pub async fn remove_from_playlist(
-    lib: State<'_, LibraryState>,
-    playlist_id: i64,
-    position: i64,
-) -> Result<(), String> {
-    let l = lib.library.clone();
-    tauri::async_runtime::spawn_blocking(move || l.remove_from_playlist(playlist_id, position))
-        .await
-        .map_err(|e| e.to_string())?
-        .map_err(|e| e.to_string())?;
-    Ok(())
-}
-
 /// Compute (or fetch cached) waveform peaks for a local audio file.
 /// Returns `buckets` normalized 0..1 values, or an empty array on failure.
 #[tauri::command]

src-tauri/src/config.rs

@@ -258,6 +258,148 @@ pub fn download_dir(app: &tauri::AppHandle, cfg: &AppConfig) -> PathBuf {
     music.join("SoulStream")
 }
 
+/// The folder holding everything the app knows ABOUT this library — the
+/// database, the review session, the artwork it has chosen and cached.
+///
+/// It lives inside the library folder because the library has to be portable:
+/// carry the drive to another machine and the records, the decisions and the
+/// covers arrive together. State kept in AppData does not travel, and an
+/// import saved at one machine and opened at another lost every choice it had
+/// made while the audio arrived intact.
+///
+/// AppData keeps only what is about the APP on THIS machine: credentials, the
+/// audio device, window state, and caches of REMOTE data (`net-cache-v1`,
+/// `stream-cache`, the GPU render caches) which are regenerable and would
+/// otherwise bloat the drive.
+///
+/// The name starts with a dot so it sorts out of the way, and the share index
+/// skips it by name as well as by only ever indexing audio.
+pub const LIBRARY_DATA_DIRNAME: &str = ".soulstream";
+
+pub fn library_data_dir(app: &tauri::AppHandle, cfg: &AppConfig) -> PathBuf {
+    download_dir(app, cfg).join(LIBRARY_DATA_DIRNAME)
+}
+
+/// `library_data_dir`, created if missing. Errors are the caller's to handle:
+/// with the drive unplugged this cannot succeed, and inventing a fallback in
+/// AppData is exactly the split-brain this whole change removes.
+pub fn ensure_library_data_dir(app: &tauri::AppHandle, cfg: &AppConfig) -> std::io::Result<PathBuf> {
+    let dir = library_data_dir(app, cfg);
+    std::fs::create_dir_all(&dir)?;
+    Ok(dir)
+}
+
+/// Everything that used to live in AppData and describes the library, moved
+/// once into the library folder. Ordered by how much it hurts to lose.
+///
+/// `(appdata_relative_name, is_dir)` — the name is kept identical on the far
+/// side so a migrated folder is recognisable, and so a half-finished migration
+/// can be resumed by simply running again.
+const MIGRATED_LIBRARY_STATE: &[(&str, bool)] = &[
+    ("library.db", false),
+    ("import-session.json", false),
+    ("import-art", true),
+    ("art", true),
+    ("artist-identity-v1", true),
+    ("artist-heroes", true),
+    ("loudness-cache.json", false),
+];
+
+/// Move library state out of AppData and into the library folder, once.
+///
+/// Rules, in order of importance:
+/// - A destination that already exists WINS and the source is left alone.
+///   The library folder is the truth; a stale AppData copy must never
+///   overwrite it, and running this twice must be a no-op.
+/// - Nothing is deleted until the copy is verified in place. A rename across
+///   volumes fails on Windows, so this is copy-then-remove, and the remove is
+///   skipped if anything went wrong — a leftover AppData copy is harmless,
+///   a half-moved database is not.
+/// - The SQLite sidecars (`-wal`, `-shm`) travel WITH the database. Moving
+///   `library.db` alone can discard committed transactions still in the WAL.
+///
+/// Returns the names actually moved, for the log.
+pub fn migrate_library_state_into_library(app: &tauri::AppHandle, cfg: &AppConfig) -> Vec<String> {
+    let Ok(dest_root) = ensure_library_data_dir(app, cfg) else {
+        return Vec::new();
+    };
+    let Ok(src_root) = app.path().app_data_dir() else {
+        return Vec::new();
+    };
+    let mut moved = Vec::new();
+    for (name, is_dir) in MIGRATED_LIBRARY_STATE {
+        let src = src_root.join(name);
+        let dest = dest_root.join(name);
+        if dest.exists() || !src.exists() {
+            continue;
+        }
+        let ok = if *is_dir {
+            copy_dir_all(&src, &dest).is_ok()
+        } else {
+            // The database's write-ahead log is part of the database.
+            let mut all = std::fs::copy(&src, &dest).is_ok();
+            for suffix in ["-wal", "-shm"] {
+                let extra = src_root.join(format!("{name}{suffix}"));
+                if extra.exists() {
+                    all &= std::fs::copy(&extra, dest_root.join(format!("{name}{suffix}"))).is_ok();
+                }
+            }
+            all
+        };
+        if !ok {
+            log::warn!("library migration: could not move {name} — leaving it in AppData");
+            continue;
+        }
+        // Verified across: retire the original rather than delete it outright,
+        // so a mistake here is recoverable by hand.
+        let retired = src_root.join(format!("{name}.moved-to-library"));
+        let _ = std::fs::remove_dir_all(&retired);
+        let _ = std::fs::remove_file(&retired);
+        if std::fs::rename(&src, &retired).is_ok() {
+            for suffix in ["-wal", "-shm"] {
+                let extra = src_root.join(format!("{name}{suffix}"));
+                let _ = std::fs::rename(&extra, src_root.join(format!("{name}{suffix}.moved-to-library")));
+            }
+        }
+        moved.push((*name).to_string());
+    }
+    moved
+}
+
+fn copy_dir_all(src: &std::path::Path, dest: &std::path::Path) -> std::io::Result<()> {
+    std::fs::create_dir_all(dest)?;
+    for entry in std::fs::read_dir(src)? {
+        let entry = entry?;
+        let to = dest.join(entry.file_name());
+        if entry.file_type()?.is_dir() {
+            copy_dir_all(&entry.path(), &to)?;
+        } else {
+            std::fs::copy(entry.path(), to)?;
+        }
+    }
+    Ok(())
+}
+
+/// Where an import writes. The chosen destination, or — when none has been
+/// chosen — the library folder itself.
+///
+/// These were two separately-nullable settings that both mean "the library",
+/// and `library_dir` being null silently disabled importing: apply refused
+/// with "no library folder chosen yet" and the picker's save-and-bank returned
+/// without doing anything or saying so. There is no sensible third answer —
+/// music imported into the library goes into the library folder — so an unset
+/// destination now means exactly that instead of meaning "refuse".
+///
+/// A destination OUTSIDE the library folder is still honoured if explicitly
+/// set, but it is a strange thing to want: `prune_outside_root` will drop
+/// those rows again at the next launch, because they are not in the library.
+pub fn import_dest_dir(app: &tauri::AppHandle, cfg: &AppConfig) -> PathBuf {
+    match cfg.library_dir.as_deref().map(str::trim) {
+        Some(d) if !d.is_empty() => PathBuf::from(d),
+        _ => download_dir(app, cfg),
+    }
+}
+
 pub const DEFAULT_LIBRARY_LAYOUT: &str = r"{artist}\{year} - {album}";
 
 pub fn library_layout(cfg: &AppConfig) -> &str {

src-tauri/src/import.rs

@@ -20,7 +20,7 @@
 use std::path::{Path, PathBuf};
 
 use serde::{Deserialize, Serialize};
-use tauri::{Emitter, Manager, State};
+use tauri::{Emitter, State};
 
 use crate::config;
 use crate::pipeline::{self, LibraryState};
@@ -368,9 +368,82 @@ pub fn import_session_clear(app: tauri::AppHandle) -> Result<(), String> {
     }
 }
 
+/// Where the source folder sits RELATIVE to the library folder, when that can
+/// be said at all. Saved beside the absolute path so a session can find its
+/// source again after the drive is carried somewhere else.
+///
+/// "I moved the whole folder" is the case this serves: source and library keep
+/// their arrangement, only the prefix changes. A source on a different drive
+/// from the library has no relative form and gets `None` — its absolute path
+/// is the only thing that could ever have identified it.
+#[tauri::command]
+pub fn import_portable_root(app: tauri::AppHandle, root: String) -> Option<String> {
+    let cfg = config::load(&app);
+    relative_to(&config::download_dir(&app, &cfg), Path::new(&root))
+}
+
+fn relative_to(from: &Path, to: &Path) -> Option<String> {
+    let key = |c: &std::path::Component| c.as_os_str().to_string_lossy().to_lowercase();
+    let (a, b): (Vec<_>, Vec<_>) = (from.components().collect(), to.components().collect());
+    // Different drives (or one relative, one not) share no prefix worth having.
+    if a.first().map(key) != b.first().map(key) {
+        return None;
+    }
+    let common = a
+        .iter()
+        .zip(b.iter())
+        .take_while(|(x, y)| key(x) == key(y))
+        .count();
+    let mut out = PathBuf::new();
+    for _ in common..a.len() {
+        out.push("..");
+    }
+    for c in &b[common..] {
+        out.push(c.as_os_str());
+    }
+    Some(out.to_string_lossy().into_owned())
+}
+
+/// The source folder this session was reviewing, as it exists NOW.
+///
+/// Tries the path as saved first — nothing has moved in the common case. Then
+/// the relative form against the current library folder, which is what makes a
+/// review started at one machine resumable at another. `None` means the folder
+/// is genuinely not there and only the user can say where it went.
+#[tauri::command]
+pub fn import_resolve_root(
+    app: tauri::AppHandle,
+    saved: Option<String>,
+    rel: Option<String>,
+) -> Option<String> {
+    if let Some(s) = saved.as_deref() {
+        if Path::new(s).is_dir() {
+            return Some(s.to_string());
+        }
+    }
+    let rel = rel?;
+    let cfg = config::load(&app);
+    let mut candidate = config::download_dir(&app, &cfg);
+    for part in rel.split(['/', '\\']) {
+        match part {
+            "" | "." => {}
+            ".." => {
+                candidate.pop();
+            }
+            p => candidate.push(p),
+        }
+    }
+    candidate
+        .is_dir()
+        .then(|| candidate.to_string_lossy().into_owned())
+}
+
+/// In the LIBRARY folder, not AppData: an import saved at one machine and
+/// carried to another used to arrive with the audio intact and every decision
+/// gone, because the review's session never left the machine that made it.
 fn session_path(app: &tauri::AppHandle) -> Result<PathBuf, String> {
-    let dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
-    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
+    let cfg = config::load(app);
+    let dir = config::ensure_library_data_dir(app, &cfg).map_err(|e| e.to_string())?;
     Ok(dir.join("import-session.json"))
 }
 
@@ -394,20 +467,19 @@ pub struct ImportDest {
 #[tauri::command]
 pub fn import_get_dest(app: tauri::AppHandle) -> Result<ImportDest, String> {
     let cfg = config::load(&app);
-    let suggested = if cfg.library_dir.is_none() {
-        Some(config::download_dir(&app, &cfg).to_string_lossy().into_owned())
-    } else {
-        None
-    };
-    let free_bytes = cfg
+    // `dir` is the destination that WILL be written to, never null. It used to
+    // report only an explicitly-chosen folder, so a null read as "no
+    // destination" and every import path disabled itself — the review's Import
+    // button greyed out and the picker's save-and-bank returned in silence.
+    let dir = config::import_dest_dir(&app, &cfg);
+    let suggested = cfg
         .library_dir
         .as_deref()
-        .or(suggested.as_deref())
-        .and_then(|d| free_space_of(Path::new(d)));
+        .map_or_else(|| Some(dir.to_string_lossy().into_owned()), |_| None);
     Ok(ImportDest {
-        dir: cfg.library_dir.clone(),
+        free_bytes: free_space_of(&dir),
+        dir: Some(dir.to_string_lossy().into_owned()),
         suggested,
-        free_bytes,
         layout: config::library_layout(&cfg).to_string(),
     })
 }
@@ -484,13 +556,62 @@ pub async fn import_local_art(
     app: tauri::AppHandle,
     source_root: String,
     rel: String,
+    parts: Option<Vec<String>>,
 ) -> Result<Option<LocalArt>, String> {
-    tauri::async_runtime::spawn_blocking(move || local_art_of(&app, &source_root, &rel))
+    let parts = parts.unwrap_or_default();
+    tauri::async_runtime::spawn_blocking(move || local_art_of(&app, &source_root, &rel, &parts))
         .await
         .map_err(|e| e.to_string())
 }
 
-fn local_art_of(app: &tauri::AppHandle, source_root: &str, rel: &str) -> Option<LocalArt> {
+/// One folder's audio, sorted, and NOT what is underneath it.
+fn audio_in_dir(dir: &Path, out: &mut Vec<PathBuf>) {
+    let Ok(entries) = std::fs::read_dir(dir) else { return };
+    let mut here: Vec<PathBuf> = entries
+        .flatten()
+        .map(|e| e.path())
+        .filter(|p| p.is_file() && audio_formats::is_audio_path(p))
+        .collect();
+    here.sort();
+    out.append(&mut here);
+}
+
+/// The audio a record actually OWNS: its own folder, plus the part folders the
+/// review named — in part order, sorted within each part. The same walk apply
+/// does, and for the same reason ([`ApplyAlbum::parts`]).
+///
+/// It is deliberately not recursive. A recursive walk is how the picker came to
+/// show a NEIGHBOUR's cover as "yours": an artist folder holding one loose file
+/// beside its albums — `Sweet\` is a single 52 MB "So Serene" rip, while
+/// `Sweet\Sweet Valley - SV [2013]\` is a separate 12-track record — collected
+/// both sets, and sorting the full paths put the subfolder first ('V' 0x56
+/// before 'o' 0x6F), so the record was shown the other record's artwork. That
+/// picture also became the record's `art_dhash`, which is what the discography
+/// pass compares against the Cover Art Archive.
+fn own_audio_files(dir: &Path, parts: &[String]) -> Vec<PathBuf> {
+    let mut out = Vec::new();
+    if parts.is_empty() {
+        audio_in_dir(dir, &mut out);
+    } else {
+        for part in parts {
+            // An empty entry is the record's own folder — a container holding
+            // loose audio beside its parts.
+            if part.is_empty() {
+                audio_in_dir(dir, &mut out);
+            } else {
+                audio_in_dir(&dir.join(part), &mut out);
+            }
+        }
+    }
+    out
+}
+
+fn local_art_of(
+    app: &tauri::AppHandle,
+    source_root: &str,
+    rel: &str,
+    parts: &[String],
+) -> Option<LocalArt> {
     let dir = Path::new(source_root).join(rel);
     if !dir.is_dir() {
         return None;
@@ -499,14 +620,22 @@ fn local_art_of(app: &tauri::AppHandle, source_root: &str, rel: &str) -> Option<
     // Embedded front cover of the first files that carry one — materialized
     // into app data so the webview can read it (the audio file itself can't
     // be handed to an <img>).
-    let mut files: Vec<PathBuf> = Vec::new();
-    pipeline::collect_audio_files(&dir, &mut files, 0);
-    files.sort();
+    let files = own_audio_files(&dir, parts);
     for f in files.iter().take(5) {
         let Ok(Some(bytes)) = tagger::extract_art(f) else { continue };
         let Ok(img) = image::load_from_memory(&bytes) else { continue };
         let (w, h) = (img.width(), img.height());
-        let cache_dir = app.path().app_data_dir().ok()?.join("import-art");
+        // In the library folder: these are the covers the review is choosing
+        // BETWEEN, and a choice made at one machine has to still be there when
+        // the drive is opened at another.
+        // v2: entries under the old name were extracted by a RECURSIVE walk, so
+        // a record sharing a folder with another one cached the neighbour's
+        // cover — and `if !target.exists()` below means a stale entry is never
+        // rewritten. Versioning the directory retires all of them at once,
+        // which is what `cover-logos-v3` and `artist-identity-v1` do.
+        let cache_dir = config::ensure_library_data_dir(app, &config::load(app))
+            .ok()?
+            .join("import-art-v2");
         std::fs::create_dir_all(&cache_dir).ok()?;
         // Stable name per rel so reopening a record reuses the extraction.
         let mut hash: u64 = 0xcbf29ce484222325;
@@ -673,6 +802,92 @@ pub(crate) fn audition_dir(download_root: &Path, rel: &str) -> PathBuf {
         .join(pipeline::safe_component(&flat))
 }
 
+/// Where one of a found copy's files lands in the pen. Shared by the download
+/// and by the completeness check below, so the two can never disagree about
+/// which file on disk is which track.
+fn pen_target(base: &Path, remote_path: &str) -> PathBuf {
+    let leaf = remote_path.rsplit('\\').next().unwrap_or(remote_path);
+    base.join(pipeline::safe_component(leaf))
+}
+
+/// Which of a found copy's files the pen does not (fully) hold, by index into
+/// `files`.
+///
+/// Transfers do not survive the app; the files they wrote do. A restored
+/// audition therefore LOOKS live and is not, and its arrived-count is a
+/// running total kept by events that stopped when the process did — after a
+/// crash, a power cut or a restart it is a number about a session that no
+/// longer exists. The pen is the only witness left, so it is what gets asked.
+///
+/// A SHORT file counts as missing: a transfer killed mid-write leaves a
+/// partial behind, and an existence check would call that track arrived and
+/// go on to import a truncated one.
+#[tauri::command]
+pub async fn import_audition_missing(
+    app: tauri::AppHandle,
+    rel: String,
+    files: Vec<AuditionFile>,
+) -> Result<Vec<usize>, String> {
+    tauri::async_runtime::spawn_blocking(move || {
+        let cfg = config::load(&app);
+        let base = audition_dir(&config::download_dir(&app, &cfg), &rel);
+        missing_in_pen(&base, &files)
+    })
+    .await
+    .map_err(|e| e.to_string())
+}
+
+/// Empty one record's pen, and report the bytes it freed.
+///
+/// Called when the review ABANDONS a peer. Switching cancels that peer's
+/// transfers, but it cannot un-write the files they already delivered, and the
+/// pen is keyed by record rather than by peer — so an abandoned copy sat there
+/// until the whole session was cleared, 189 MB of a stranger's Centipede Hz
+/// among them. Apply no longer files those (it takes the chosen copy's own
+/// files by name), so this is about disk, not correctness.
+///
+/// The path is DERIVED from `rel` here, exactly as the download and the
+/// apply-time move derive it. Nothing outside the pen can be named, whatever
+/// the caller passes.
+#[tauri::command]
+pub async fn import_audition_clear(app: tauri::AppHandle, rel: String) -> Result<u64, String> {
+    tauri::async_runtime::spawn_blocking(move || {
+        let cfg = config::load(&app);
+        let dir = audition_dir(&config::download_dir(&app, &cfg), &rel);
+        if !dir.is_dir() {
+            return Ok(0);
+        }
+        let freed: u64 = std::fs::read_dir(&dir)
+            .into_iter()
+            .flatten()
+            .flatten()
+            .filter_map(|e| e.metadata().ok())
+            .filter(|m| m.is_file())
+            .map(|m| m.len())
+            .sum();
+        std::fs::remove_dir_all(&dir).map_err(|e| e.to_string())?;
+        Ok(freed)
+    })
+    .await
+    .map_err(|e| e.to_string())?
+}
+
+/// The rule itself, without an app handle so it can be tested. A file the pen
+/// does not hold is missing; so is one it holds only part of. A size the peer
+/// never stated (0) cannot be checked against, and a file that is there is
+/// taken at its word rather than called missing forever.
+fn missing_in_pen(base: &Path, files: &[AuditionFile]) -> Vec<usize> {
+    files
+        .iter()
+        .enumerate()
+        .filter(|(_, f)| match std::fs::metadata(pen_target(base, &f.path)) {
+            Ok(m) => f.size > 0 && m.len() < f.size,
+            Err(_) => true,
+        })
+        .map(|(i, _)| i)
+        .collect()
+}
+
 /// Download a found album copy into `(Cache)\_audition\<rel>\` for the
 /// version comparison — the WHOLE album (his call: keeping it later is a
 /// move, not a re-download, and one search's worth of requests).
@@ -701,8 +916,7 @@ pub async fn import_audition(
     std::fs::create_dir_all(&base).map_err(|e| e.to_string())?;
     let mut ids = Vec::with_capacity(files.len());
     for (i, f) in files.iter().enumerate() {
-        let leaf = f.path.rsplit('\\').next().unwrap_or(&f.path);
-        let target = base.join(pipeline::safe_component(leaf));
+        let target = pen_target(&base, &f.path);
         // Claimed BEFORE the transfer task is spawned: it emits Connecting
         // immediately, and an event whose id is not yet registered is one the
         // UI throws away — and worse, one commands.rs routes down the ordinary
@@ -755,13 +969,67 @@ pub async fn import_probe_file(path: String) -> Result<ProbeResult, String> {
 /// opened — never a batch (decision 12). Deezer down the cleaned try-list,
 /// MusicBrainz when Deezer's answer is absent or wrong; the crate holds the
 /// whole flow (metadata::identify_album). Read-only.
+///
+/// `title` is what the record calls ITSELF (the tag majority); `folder` is the
+/// folder it sits in, asked after it as the second witness for a record whose
+/// tags are wrong (metadata::identify_titles).
+///
+/// The rest is the record's SHAPE, which is what the discography pass compares
+/// when no phrase can find it: how many files it has, what they are called, the
+/// year, and — read here rather than shipped over IPC, because a master cover
+/// can be 8 MB — the perceptual hash of its own embedded artwork.
 #[tauri::command]
 pub async fn import_identify(
+    app: tauri::AppHandle,
     state: State<'_, LibraryState>,
     artist: String,
     title: String,
+    folder: Option<String>,
+    tracks: Option<usize>,
+    track_titles: Option<Vec<String>>,
+    year: Option<u32>,
+    source_root: Option<String>,
+    rel: Option<String>,
+    parts: Option<Vec<String>>,
 ) -> Result<metadata::IdentifyResult, String> {
-    Ok(state.metadata.identify_album(&artist, &title).await)
+    // The record's OWN parts, so the hash is its own cover — a record sharing a
+    // folder with another one used to hash the neighbour's.
+    let parts = parts.unwrap_or_default();
+    let art_dhash = match (source_root.as_deref(), rel.as_deref()) {
+        (Some(root), Some(rel)) => local_art_dhash(&app, root, rel, &parts).await,
+        _ => None,
+    };
+    let shape = metadata::RecordShape {
+        tracks,
+        track_titles: track_titles.unwrap_or_default(),
+        year,
+        art_dhash,
+    };
+    Ok(state
+        .metadata
+        .identify_album(&artist, &title, folder.as_deref(), &shape)
+        .await)
+}
+
+/// The perceptual hash of a record's OWN cover, for comparison against an
+/// artist's discography. Reuses `local_art_of`, so it reads the extraction that
+/// the artwork panel already cached rather than decoding the audio again.
+async fn local_art_dhash(
+    app: &tauri::AppHandle,
+    source_root: &str,
+    rel: &str,
+    parts: &[String],
+) -> Option<u64> {
+    let art = {
+        let app = app.clone();
+        let (root, rel) = (source_root.to_string(), rel.to_string());
+        let parts = parts.to_vec();
+        tauri::async_runtime::spawn_blocking(move || local_art_of(&app, &root, &rel, &parts))
+            .await
+            .ok()??
+    };
+    let bytes = tokio::fs::read(&art.path).await.ok()?;
+    metadata::cover_dhash(&bytes)
 }
 
 /// The artwork panel's data: reference + candidates with decoded sizes and
@@ -835,6 +1103,15 @@ pub struct ApplyChoices {
     /// fewer than this means the transfer never finished, and importing it
     /// would file a truncated album — apply refuses instead.
     pub audio_tracks: Option<usize>,
+    /// The chosen copy's own files, as the peer named them. The pen is keyed
+    /// by RECORD, not by peer, so a record that changed peers mid-audition has
+    /// TWO copies in one folder: switching cancels the old transfers but
+    /// cannot un-write the files they already delivered. Taking "every audio
+    /// file in the pen" then files both — Centipede Hz landed as 17 tracks,
+    /// deletia's 11 plus the 6 smash2 got through before it was dropped.
+    ///
+    /// None (an older session, or "yours") keeps the previous behaviour.
+    pub audio_files: Option<Vec<String>>,
 }
 
 #[derive(Debug, Clone, Serialize)]
@@ -880,9 +1157,9 @@ pub async fn import_apply(
     albums: Vec<ApplyAlbum>,
 ) -> Result<ApplyReport, String> {
     let cfg = config::load(&app);
-    let Some(dest_root) = cfg.library_dir.clone().map(PathBuf::from) else {
-        return Err("no library folder chosen yet".into());
-    };
+    // An unset destination means the library folder, not a refusal — see
+    // `config::import_dest_dir`.
+    let dest_root = config::import_dest_dir(&app, &cfg);
     let layout = config::library_layout(&cfg).to_string();
     let embed_max_edge = config::embed_art_max_edge(&cfg);
     let replace_embedded = config::replace_embedded_art(&cfg);
@@ -1023,16 +1300,43 @@ fn apply_one(
     // match the one the review displayed, because `track_titles` is
     // positional: disagree here and every title past the first part lands on
     // the wrong file. A found copy overrides this — the pen is flat.
+    // Which disc each file belongs to, aligned with `files`. Empty (all None)
+    // for anything that is not a folded release — there, the disc is whatever
+    // the file's own tag says, read back after the copy.
+    let mut discs: Vec<Option<u32>> = Vec::new();
     let mut files: Vec<PathBuf> = if take_theirs || a.parts.is_empty() {
         let mut f = audio_files_in(&src_dir);
+        // A found copy is the files the REVIEW chose, not whatever the folder
+        // happens to hold. Same derivation as the download used, so a name the
+        // peer sent maps to exactly the file it wrote. Sorting stays where it
+        // was: `track_titles` is positional against this order.
+        if take_theirs {
+            if let Some(names) = a.choices.as_ref().and_then(|c| c.audio_files.as_ref()) {
+                if !names.is_empty() {
+                    let chosen: std::collections::HashSet<PathBuf> =
+                        names.iter().map(|n| pen_target(&pen_dir, n)).collect();
+                    f.retain(|p| chosen.contains(p));
+                }
+            }
+        }
         f.sort();
         f
     } else {
         let mut out = Vec::new();
-        for part in &a.parts {
+        for (n, part) in a.parts.iter().enumerate() {
             let dir = if part.is_empty() { src_dir.clone() } else { src_dir.join(part) };
             let mut f = audio_files_in(&dir);
             f.sort();
+            // The parts ARE the discs, in the order the review joined them.
+            // Every part numbers its own tracks from 1, so without this the
+            // flattened album reads as eleven track-1s in alphabetical order —
+            // which is exactly what Analord's eleven volumes did.
+            //
+            // ONE part is not a multi-disc release: it is a container folder
+            // whose tracks live a level down, and numbering it "disc 1" would
+            // put a disc heading on an ordinary album.
+            let disc = if a.parts.len() > 1 { Some(n as u32 + 1) } else { None };
+            discs.extend(std::iter::repeat(disc).take(f.len()));
             out.append(&mut f);
         }
         out
@@ -1217,16 +1521,24 @@ fn apply_one(
         // chosen cover embeds at the same bounded size downloads use, and
         // replaces an existing picture when config says so — an explicit
         // pick in the review is the strongest consent that config models.
-        if let Some(ch) = &a.choices {
+        // The disc is STRUCTURE, not a review choice: it is what the record is
+        // made OF, and a record nobody opened still has to come out readable.
+        // So it is written even when there are no choices at all — and into
+        // the FILE, because the folder that carried the answer is gone the
+        // moment the parts are filed flat.
+        let disc = discs.get(i).copied().flatten();
+        if a.choices.is_some() || disc.is_some() {
+            let ch = a.choices.as_ref();
             let write = tagger::TagWrite {
-                artist: ch.artist.clone(),
+                artist: ch.and_then(|c| c.artist.clone()),
                 album_artist: None,
-                album: ch.album.clone(),
+                album: ch.and_then(|c| c.album.clone()),
                 title: track_titles.and_then(|t| t.get(i).cloned().flatten()),
                 track_no: None,
-                year: ch.year,
-                label: ch.label.clone(),
-                genre: ch.genre.clone(),
+                disc_no: disc,
+                year: ch.and_then(|c| c.year),
+                label: ch.and_then(|c| c.label.clone()),
+                genre: ch.and_then(|c| c.genre.clone()),
             };
             let embed = embed_art.as_deref();
             if let Err(e) = tagger::write_tags(
@@ -1249,6 +1561,9 @@ fn apply_one(
         library
             .upsert_track(
                 album_id,
+                // The fold's answer first: it is the structure we just imposed
+                // on this record. Everything else takes the file at its word.
+                disc.or(s.disc_no),
                 s.track_no,
                 &title,
                 &artist,
@@ -1328,6 +1643,39 @@ fn apply_one(
 mod tests {
     use super::*;
 
+    /// What the pen holds is what an audition actually got — and a PARTIAL
+    /// file is not an arrival. A transfer killed mid-write (the app closing, a
+    /// power cut) leaves a short file behind, and an existence check would
+    /// call that track arrived, stop asking for it, and go on to import a
+    /// truncated one. This is the check that unsticks a record whose
+    /// transfers died with the process that was watching them.
+    #[test]
+    fn the_pen_counts_a_short_file_as_missing_not_arrived() {
+        let tmp = tempfile::tempdir().unwrap();
+        let base = tmp.path();
+        let f = |name: &str, size: u64| AuditionFile {
+            path: format!("@peer\\Music\\Album\\{name}"),
+            size,
+        };
+        let files = vec![
+            f("01 whole.flac", 10),
+            f("02 partial.flac", 10),
+            f("03 never came.flac", 10),
+            f("04 size unstated.flac", 0),
+        ];
+        std::fs::write(base.join("01 whole.flac"), b"0123456789").unwrap();
+        std::fs::write(base.join("02 partial.flac"), b"012").unwrap();
+        // 03 never arrived at all.
+        std::fs::write(base.join("04 size unstated.flac"), b"anything").unwrap();
+
+        assert_eq!(
+            missing_in_pen(base, &files),
+            vec![1, 2],
+            "the partial and the absent are owed; the whole one and the \
+             unstated-size one are not"
+        );
+    }
+
     /// A record laid out the way apply sees one: the user's folder, the
     /// audition pen beside the download root, and a library root to file
     /// into. Files carry distinct bytes so "which version landed" is a
@@ -1378,6 +1726,7 @@ mod tests {
             track_titles: None,
             audio: Some(audio.into()),
             audio_tracks: want,
+            audio_files: None,
         }
     }
 
@@ -1422,6 +1771,123 @@ mod tests {
         out
     }
 
+    /// A folded release is ONE album made of disc folders, and every folder
+    /// numbers its tracks from 1. The disc has to survive the flattening or
+    /// the album becomes unreadable: eleven volumes of Analord filed as one
+    /// record put eleven "track 1"s at the top of the list in alphabetical
+    /// order, with nothing anywhere to say which volume any of them was from.
+    #[test]
+    fn a_folded_release_keeps_its_discs() {
+        let b = bed(0);
+        for (part, names) in [("CD1", ["01 one.mp3", "02 two.mp3"]), ("CD2", ["01 three.mp3", "02 four.mp3"])] {
+            let dir = b.src_root.join(&b.rel).join(part);
+            std::fs::create_dir_all(&dir).unwrap();
+            for n in names {
+                std::fs::write(dir.join(n), format!("{part} {n}")).unwrap();
+            }
+        }
+        let mut a = album(&b, None);
+        a.parts = vec!["CD1".into(), "CD2".into()];
+
+        let (tracks, _, _) = run(&b, &a).unwrap();
+        assert_eq!(tracks, 4);
+
+        let album_id = b
+            .library
+            .upsert_album("Weezer", "Pinkerton", Some(1996), None, None, None, 0)
+            .unwrap();
+        let rows = b.library.album_tracks(album_id).unwrap();
+        assert_eq!(
+            rows.iter().map(|t| t.disc_no).collect::<Vec<_>>(),
+            vec![Some(1), Some(1), Some(2), Some(2)],
+            "disc-major order, both discs numbered in the order the fold joined them"
+        );
+        // A single part is a container folder, not a two-disc set — numbering
+        // it would put a disc heading on an ordinary album.
+        let mut solo = album(&b, None);
+        solo.parts = vec!["CD1".into()];
+        let b2 = bed(0);
+        let dir = b2.src_root.join(&b2.rel).join("CD1");
+        std::fs::create_dir_all(&dir).unwrap();
+        std::fs::write(dir.join("01 one.mp3"), "only").unwrap();
+        run(&b2, &solo).unwrap();
+        let solo_id = b2
+            .library
+            .upsert_album("Weezer", "Pinkerton", Some(1996), None, None, None, 0)
+            .unwrap();
+        assert!(
+            b2.library.album_tracks(solo_id).unwrap().iter().all(|t| t.disc_no.is_none()),
+            "one part is not a disc"
+        );
+    }
+
+    /// The pen path is DERIVED from the record, never passed in — and the
+    /// record is a folder name off somebody's disk, so it can contain
+    /// anything. `import_audition_clear` deletes this directory, so "it always
+    /// lands inside the cache, and is always exactly one folder deep" is a
+    /// property worth holding on to rather than assuming.
+    #[test]
+    fn a_records_pen_can_never_name_anything_outside_the_cache() {
+        let root = Path::new("D:\\Music\\Library");
+        let pen = root.join("(Cache)").join("_audition");
+        for rel in [
+            "..\\..\\Windows\\System32",
+            "../../../etc/passwd",
+            "C:\\Windows",
+            "Artist\\Album",
+            ".",
+            "",
+        ] {
+            let dir = audition_dir(root, rel);
+            assert!(dir.starts_with(&pen), "{rel:?} escaped the pen: {dir:?}");
+            assert_eq!(
+                dir.components().count(),
+                pen.components().count() + 1,
+                "{rel:?} is not exactly one folder inside the pen: {dir:?}"
+            );
+        }
+    }
+
+    /// A record that changed peers mid-audition has TWO copies in one pen. The
+    /// switch cancels the abandoned peer's transfers, but it cannot un-write
+    /// the files they already delivered, and the pen is keyed by RECORD rather
+    /// than by peer. Taking "every audio file in the folder" filed both:
+    /// Centipede Hz landed as 17 tracks — deletia's 11 plus the 6 smash2 got
+    /// through before it was dropped — each duplicate under its own peer's
+    /// naming. The copy the REVIEW chose is the one that imports.
+    #[test]
+    fn the_dropped_peers_files_do_not_import_beside_the_copy_that_was_kept() {
+        let b = bed(2); // the chosen copy: "01 track.flac", "02 track.flac"
+        let pen = audition_dir(&b.download_root, &b.rel);
+        // What the abandoned peer left behind: the same music, its own naming.
+        for n in 1..=2 {
+            std::fs::write(
+                pen.join(format!("Weezer-Pinkerton-{n:02}-track-[FLAC 16bit].flac")),
+                format!("dropped peer {n}"),
+            )
+            .unwrap();
+        }
+        let mut ch = choices("theirs", Some(2));
+        ch.audio_files = Some(vec![
+            "@peer\\Music\\Pinkerton\\01 track.flac".into(),
+            "@peer\\Music\\Pinkerton\\02 track.flac".into(),
+        ]);
+
+        let (tracks, _, _) = run(&b, &album(&b, Some(ch))).unwrap();
+
+        assert_eq!(tracks, 2, "only the chosen copy's tracks are filed");
+        let names: Vec<String> = landed(&b).into_iter().map(|(n, _)| n).collect();
+        assert!(
+            names.iter().all(|n| !n.contains("[FLAC 16bit]")),
+            "the dropped peer's files must not reach the library: {names:?}"
+        );
+        assert_eq!(
+            names.iter().filter(|n| n.ends_with(".flac")).count(),
+            2,
+            "eleven-plus-six is what this test exists to prevent: {names:?}"
+        );
+    }
+
     /// Re-importing the same record must not copy it again — even though the
     /// imported files no longer match their sources byte for byte.
     ///
@@ -1659,7 +2125,7 @@ mod tests {
             .upsert_album("Weezer", "Pinkerton", Some(1996), None, None, None, 0)
             .unwrap();
         b.library
-            .upsert_track(album_id, None, "Stray", "Weezer", None, None, None, None, Some(5),
+            .upsert_track(album_id, None, None, "Stray", "Weezer", None, None, None, None, Some(5),
                 &stray.to_string_lossy(), 0)
             .unwrap();
 

src-tauri/src/lib.rs

@@ -6,8 +6,11 @@ mod hero_crop;
 mod import;
 mod hero_detector;
 mod loudness;
+mod lyrics;
 mod pipeline;
 mod playback;
+mod playlist_formats;
+mod playlists;
 mod preview;
 mod smtc;
 mod state;
@@ -93,14 +96,41 @@ pub fn run() {
             commands::unfollow_artist,
             commands::home_artist_news,
             commands::home_warm,
-            commands::list_playlists,
-            commands::create_playlist,
-            commands::delete_playlist,
-            commands::playlist_tracks,
-            commands::add_to_playlist,
-            commands::remove_from_playlist,
+            playlists::list_playlists,
+            playlists::create_playlist,
+            playlists::rename_playlist,
+            playlists::set_playlist_description,
+            playlists::set_playlist_pinned,
+            playlists::duplicate_playlist,
+            playlists::delete_playlist,
+            playlists::playlist_items,
+            playlists::playlist_add_items,
+            playlists::playlist_remove_items,
+            playlists::playlist_set_order,
+            playlists::playlist_relink_item,
+            playlists::playlist_cover,
+            playlists::playlist_cover_pick,
+            playlists::playlist_cover_clear,
+            playlists::playlist_import_probe,
+            playlists::playlist_import_folder,
+            playlists::playlist_import_text,
+            playlists::playlist_import_commit,
+            playlists::playlist_export,
+            playlists::library_track_search,
+            lyrics::lyrics_get,
+            lyrics::lyrics_search,
+            lyrics::lyrics_select,
+            lyrics::lyrics_set_offset,
+            lyrics::lyrics_set_auto_sync,
+            lyrics::lyrics_prepare_instrumental,
+            lyrics::lyrics_vocal_activity,
+            lyrics::lyrics_save_lines,
+            lyrics::lyrics_save_text,
+            lyrics::lyrics_clear,
             commands::catalog_search,
             import::import_scan,
+            import::import_portable_root,
+            import::import_resolve_root,
             import::import_session_get,
             import::import_session_set,
             import::import_session_clear,
@@ -111,6 +141,8 @@ pub fn run() {
             import::import_cover_report,
             import::import_local_art,
             import::import_audition,
+            import::import_audition_missing,
+            import::import_audition_clear,
             import::import_probe_file,
             pipeline::rescan_library,
             commands::catalog_artist,

src-tauri/src/loudness.rs

@@ -101,8 +101,14 @@ pub fn snapshot(app: &tauri::AppHandle) -> (bool, f64, Option<CurrentTrack>) {
     )
 }
 
+/// Keyed by track path, so it describes THIS library's files and belongs
+/// beside them. Measuring a whole library again on another machine is hours
+/// of work that the drive was already carrying the answer to.
 fn cache_file(app: &tauri::AppHandle) -> Option<PathBuf> {
-    app.path().app_data_dir().ok().map(|d| d.join(CACHE_FILE))
+    let cfg = crate::config::load(app);
+    crate::config::ensure_library_data_dir(app, &cfg)
+        .ok()
+        .map(|d| d.join(CACHE_FILE))
 }
 
 pub fn init(app: &tauri::AppHandle) {
@@ -947,8 +953,10 @@ mod tests {
                     .and_then(|e| e.to_str())
                     .unwrap_or_default()
                     .to_ascii_lowercase();
-                if matches!(ext.as_str(), "flac" | "mp3" | "ogg" | "opus" | "wav" | "m4a" | "aiff")
-                {
+                // Measuring means decoding, so this is the PLAYABLE table, not
+                // the recognised one — an `.opus` or `.wv` here only produces a
+                // failed decode (or, for WavPack, NaN).
+                if audio_formats::is_playable_ext(&ext) {
                     files.push(path);
                 }
             }
@@ -1092,8 +1100,7 @@ mod tests {
                     .and_then(|e| e.to_str())
                     .unwrap_or_default()
                     .to_ascii_lowercase();
-                if !matches!(ext.as_str(), "flac" | "mp3" | "ogg" | "opus" | "wav" | "m4a" | "aiff")
-                {
+                if !audio_formats::is_playable_ext(&ext) {
                     continue;
                 }
                 let artist = path

src-tauri/src/pipeline.rs

@@ -11,11 +11,9 @@ use library::Library;
 use metadata::{AlbumMeta, MetadataClient};
 use tagger::{TagSummary, TagWrite};
 
-// aiff/aif joined for the import tool: the reference library carries 13 AIFF
-// tracks that a scan would otherwise silently drop, and "silently" is the
-// problem — the album imports incomplete with no warning.
-pub(crate) const AUDIO_EXTS: [&str; 10] =
-    ["flac", "mp3", "m4a", "ogg", "opus", "wav", "aac", "wma", "aiff", "aif"];
+// The one table, in `audio-formats`. This used to be a local list that
+// disagreed with the share index and the row pruner — the scanner indexed
+// `.aiff` and the pruner deleted it on the next startup.
 
 pub struct LibraryState {
     pub library: Arc<Library>,
@@ -140,12 +138,53 @@ fn spawn_identity_warmer(app: tauri::AppHandle) {
 }
 
 pub fn init(app: &tauri::AppHandle) -> Result<(), String> {
-    let data_dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
-    std::fs::create_dir_all(&data_dir).map_err(|e| e.to_string())?;
+    // AppData keeps only what is about the APP on THIS machine — the cache of
+    // remote provider responses. Everything describing the LIBRARY lives in
+    // the library folder so it travels with the music.
+    let app_dir = app.path().app_data_dir().map_err(|e| e.to_string())?;
+    std::fs::create_dir_all(&app_dir).map_err(|e| e.to_string())?;
+
+    let cfg = crate::config::load(app);
+    let library_root = crate::config::download_dir(app, &cfg);
+    let moved = crate::config::migrate_library_state_into_library(app, &cfg);
+    if !moved.is_empty() {
+        log::info!("library state moved into the library folder: {}", moved.join(", "));
+    }
+
+    // With the drive unplugged there is no library to open. Fall back to a
+    // machine-local database rather than refusing to start — the real one
+    // returns with the drive, and nothing here writes into the wrong library
+    // because every path is compared against the configured root.
+    let (data_dir, portable) = match crate::config::ensure_library_data_dir(app, &cfg) {
+        Ok(dir) => (dir, true),
+        Err(e) => {
+            log::warn!(
+                "library folder {} is unavailable ({e}) — running with a local database until it returns",
+                library_root.display()
+            );
+            (app_dir.clone(), false)
+        }
+    };
     let art_dir = data_dir.join("art");
     std::fs::create_dir_all(&art_dir).map_err(|e| e.to_string())?;
 
     let library = Arc::new(Library::open(&data_dir.join("library.db")).map_err(|e| e.to_string())?);
+    if portable {
+        // The art cache moved with the database, so rows written before the
+        // move still point into AppData. Re-point them before anything paints.
+        match library.rewrite_path_prefix(&app_dir.join("art"), &art_dir) {
+            Ok(n) if n > 0 => log::info!("library: {n} artwork paths follow the art cache into the library folder"),
+            Err(e) => log::warn!("library: could not re-point artwork paths: {e}"),
+            _ => {}
+        }
+        // And the library itself may have arrived at a new drive letter or on
+        // a different machine entirely.
+        match library.rebase_to_root(&library_root) {
+            Ok(n) if n > 0 => log::info!("library moved: re-based {n} stored paths onto {}", library_root.display()),
+            Err(e) => log::warn!("library: could not re-base stored paths: {e}"),
+            _ => {}
+        }
+    }
     let repair_library = library.clone();
     let repair_art_dir = art_dir.clone();
 
@@ -156,10 +195,13 @@ pub fn init(app: &tauri::AppHandle) -> Result<(), String> {
         // description warmth instead of re-serializing MusicBrainz at 1 req/s.
         metadata: Arc::new({
             let client = MetadataClient::new()
-                .with_disk_cache(data_dir.join("net-cache-v1"))
+                // Provider responses are about the WORLD, not this library, and
+                // they are cheap to refetch — they stay on the machine.
+                .with_disk_cache(app_dir.join("net-cache-v1"))
                 // Its own directory, NOT inside the cache above: that one is
                 // pruned by mtime, and these are verdicts rather than cached
-                // responses.
+                // responses. Verdicts about the library's artists are library
+                // state, so they travel with it.
                 .with_identity_store(data_dir.join("artist-identity-v1"));
             // Hero candidate/scoring diagnostics on demand, so an in-APP hero
             // resolution can be compared against `hero_source_probe` — the two
@@ -193,8 +235,33 @@ pub fn init(app: &tauri::AppHandle) -> Result<(), String> {
             }
         }
         let state = handle.state::<LibraryState>();
+        // Before anything asks the disk: the library folder decides what is IN
+        // the library. Rows from a folder that used to hold it are not "still
+        // there because their files exist" — they belong to another library.
+        let lib = state.library.clone();
+        let root = downloads_dir(&handle);
+        if let Ok(Ok(dropped)) =
+            tauri::async_runtime::spawn_blocking(move || lib.prune_outside_root(&root)).await
+        {
+            if dropped > 0 {
+                log::info!("library: dropped {dropped} tracks outside the library folder");
+            }
+        }
         let lib = state.library.clone();
         let _ = tauri::async_runtime::spawn_blocking(move || lib.prune_missing()).await;
+        // After the prune, every surviving track has a file — so "the folder
+        // this album lives in" is answerable, and any cover pointing somewhere
+        // else is another album's. Files move (a re-import into a new layout, a
+        // drive back at a different letter) and nothing else re-asks.
+        let lib = state.library.clone();
+        let art = state.art_dir.clone();
+        if let Ok(Ok(moved)) =
+            tauri::async_runtime::spawn_blocking(move || lib.reanchor_album_art(&art)).await
+        {
+            if moved > 0 {
+                log::info!("library repair: re-anchored artwork for {moved} albums");
+            }
+        }
         let lib = state.library.clone();
         if let Ok(Ok(removed)) =
             tauri::async_runtime::spawn_blocking(move || lib.prune_non_audio()).await
@@ -459,16 +526,15 @@ pub(crate) fn collect_audio_files(dir: &Path, out: &mut Vec<PathBuf>, depth: u8)
             // "(Cache)" is the download staging pen — a completed file
             // sitting there is seconds from being organized out, and
             // indexing it would pin a library row to a staging path.
-            if path.file_name().is_some_and(|n| n == "(Cache)") {
+            // ".soulstream" is the library's own state, not music.
+            if path
+                .file_name()
+                .is_some_and(|n| n == "(Cache)" || n == crate::config::LIBRARY_DATA_DIRNAME)
+            {
                 continue;
             }
             collect_audio_files(&path, out, depth + 1);
-        } else if path
-            .extension()
-            .and_then(|e| e.to_str())
-            .map(|e| AUDIO_EXTS.contains(&e.to_ascii_lowercase().as_str()))
-            .unwrap_or(false)
-        {
+        } else if audio_formats::is_audio_path(&path) {
             out.push(path);
         }
     }
@@ -659,6 +725,9 @@ pub async fn process_file(app: &tauri::AppHandle, local_path: &Path, remote_path
         album: summary.album.is_none().then_some(final_album.clone()),
         title: summary.title.is_none().then_some(title.clone()),
         track_no: summary.track_no.or(parsed.track_no),
+        // Nothing to add: a downloaded file either carries its disc or has no
+        // disc to carry, and there is nowhere here to learn one from.
+        disc_no: None,
         year: summary.year.is_none().then(|| final_year).flatten(),
         label: None,
         genre: None,
@@ -701,6 +770,9 @@ pub async fn process_file(app: &tauri::AppHandle, local_path: &Path, remote_path
         let p = library_path.to_string_lossy().into_owned();
         let art = art_path.as_ref().map(|a| a.to_string_lossy().into_owned());
         let track_no = summary.track_no.or(parsed.track_no);
+        // Only what the file itself says. There is no filename convention for
+        // a disc worth guessing from, and a wrong disc reorders an album.
+        let disc_no = summary.disc_no;
         let (duration, bitrate) = (summary.duration_secs, summary.bitrate_kbps);
         let (sample_rate, bit_depth) = (summary.sample_rate, summary.bit_depth);
         let size = std::fs::metadata(&library_path).ok().map(|m| m.len());
@@ -724,6 +796,7 @@ pub async fn process_file(app: &tauri::AppHandle, local_path: &Path, remote_path
             }
             lib.upsert_track(
                 album_id,
+                disc_no,
                 track_no,
                 &title2,
                 &artist,
@@ -853,10 +926,7 @@ pub async fn refresh_all_artist_art(app: &tauri::AppHandle) -> Result<usize, Str
 }
 
 pub fn is_audio_path(path: &Path) -> bool {
-    path.extension()
-        .and_then(|e| e.to_str())
-        .map(|e| AUDIO_EXTS.contains(&e.to_ascii_lowercase().as_str()))
-        .unwrap_or(false)
+    audio_formats::is_audio_path(path)
 }
 
 /// Move a newly completed download into one album directory under the managed

src/App.svelte

@@ -4,6 +4,8 @@
     import PlayerBar from "./components/PlayerBar.svelte";
     import NowPlaying from "./components/NowPlaying.svelte";
     import ArtworkViewer from "./components/ArtworkViewer.svelte";
+    import LyricsOverlay from "./components/LyricsOverlay.svelte";
+    import LyricsSyncEditor from "./components/LyricsSyncEditor.svelte";
     import ImportWindow from "./components/ImportWindow.svelte";
     import LoginModal from "./components/LoginModal.svelte";
     import PreviewOverlay from "./components/PreviewOverlay.svelte";
@@ -126,6 +128,8 @@
     <FollowToast />
     <ImportToast />
     <PreviewOverlay />
+    <LyricsOverlay />
+    <LyricsSyncEditor />
     <ArtworkViewer />
     <ImportWindow />
     <LoginModal />

src/components/Icon.svelte

@@ -76,6 +76,13 @@
         "brand-bandcamp": '<path d="M22 7h-9.5L2 17h9.5L22 7z"/>',
         "brand-soundcloud": '<path d="M17.5 19H9a7 7 0 1 1 6.71-9h1.79a4.5 4.5 0 1 1 0 9Z"/>',
         "hard-drive": '<line x1="22" x2="2" y1="12" y2="12"/><path d="M5.45 5.11 2 12v6a2 2 0 0 0 2 2h16a2 2 0 0 0 2-2v-6l-3.45-6.89A2 2 0 0 0 16.76 4H7.24a2 2 0 0 0-1.79 1.11z"/><line x1="6" x2="6.01" y1="16" y2="16"/><line x1="10" x2="10.01" y1="16" y2="16"/>',
+        pin: '<path d="M12 17v5"/><path d="M9 10.76a2 2 0 0 1-1.11 1.79l-1.78.9A2 2 0 0 0 5 15.24V16a1 1 0 0 0 1 1h12a1 1 0 0 0 1-1v-.76a2 2 0 0 0-1.11-1.79l-1.78-.9A2 2 0 0 1 15 10.76V7h1a2 2 0 0 0 2-2V4a2 2 0 0 0-2-2H8a2 2 0 0 0-2 2v1a2 2 0 0 0 2 2h1z"/>',
+        // Drag handle for reorderable rows (six dots, reads at 14px).
+        grip: '<circle cx="9" cy="5" r="1"/><circle cx="9" cy="12" r="1"/><circle cx="9" cy="19" r="1"/><circle cx="15" cy="5" r="1"/><circle cx="15" cy="12" r="1"/><circle cx="15" cy="19" r="1"/>',
+        export: '<path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="17 8 12 3 7 8"/><line x1="12" x2="12" y1="3" y2="15"/>',
+        pencil: '<path d="M21.174 6.812a1 1 0 0 0-3.986-3.987L3.842 16.174a2 2 0 0 0-.5.83l-1.321 4.352a.5.5 0 0 0 .623.622l4.353-1.32a2 2 0 0 0 .83-.497z"/><path d="m15 5 4 4"/>',
+        "file-text": '<path d="M15 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7Z"/><path d="M14 2v4a2 2 0 0 0 2 2h4"/><path d="M10 9H8"/><path d="M16 13H8"/><path d="M16 17H8"/>',
+        link: '<path d="M9 17H7A5 5 0 0 1 7 7h2"/><path d="M15 7h2a5 5 0 1 1 0 10h-2"/><line x1="8" x2="16" y1="12" y2="12"/>',
     };
 </script>
 

src/components/ImportPicker.svelte

@@ -16,7 +16,7 @@
     import { onDestroy } from "svelte";
     import { getArtMaster, playLocalFile, player, togglePlayPause } from "../lib/state.svelte.js";
     import { evidence as matchEvidence, normx } from "../lib/import-evidence.js";
-    import { IDENTIFY_ENGINE } from "../lib/import-title.js";
+    import { IDENTIFY_ENGINE, majority } from "../lib/import-title.js";
 
     let {
         album: a,           // derived album from ImportWindow (rel, title, …)
@@ -101,14 +101,79 @@
         (async () => {
             try {
                 const ask = albumName ?? a.title;
-                const r = await api.importIdentify(artist, ask);
+                // The folder rides along as the second witness: `ask` is the
+                // tags' claim, and tags carry typos the folder does not
+                // ("Nonagon Infiniry" on all nine files). Asked after it, and
+                // deduped away when they agree.
+                //
+                // The SHAPE goes too — count, track titles, year, and where the
+                // files live. A name is only one fact about a record, and it is
+                // the one most often wrong; the discography pass compares the
+                // rest when no phrase can find it.
+                const shape = {
+                    tracks: a.tracks?.length ?? null,
+                    trackTitles: (a.tracks ?? []).map((t) => t.title).filter(Boolean),
+                    year: a.year ?? null,
+                    // `parts` bounds the artwork hash to the record's OWN audio.
+                    // Without it the backend walked the folder recursively, and
+                    // a record sharing a folder with another one hashed the
+                    // neighbour's cover — see own_audio_files in import.rs.
+                    sourceRoot, rel, parts: a.parts ?? [],
+                };
+                let r = await api.importIdentify(artist, ask, a.title, shape);
+                let askedArtist = artist;
+
+                // The FOLDER is asked first, and stays the default: it is one
+                // deliberate decision, where track artist tags carry featured
+                // guests, compilation contributors and classical performers.
+                //
+                // But a folder is sometimes not the artist at all — "Band Of
+                // Gypsys" holding six files that every one of them tags
+                // "Jimi Hendrix" — and then the ask is wrong twice over,
+                // because the try-list strips that "artist" off the front of
+                // the title and asks the providers for what is left of it.
+                //
+                // Only when the first ask came back with NOTHING, or with a
+                // record the judge calls wrong. A candidate that already
+                // stands is not this function's business.
+                const judge = (res, who) => (res?.candidate
+                    ? matchEvidence(res.candidate, who, ask, a.tracks.length).verdict
+                    : "none");
+                if (["none", "bad"].includes(judge(r, artist))) {
+                    const tagged = majority((a.tracks ?? []).map((t) => t.artist));
+                    if (tagged && normx(tagged) !== normx(artist)) {
+                        const alt = await api.importIdentify(tagged, ask, a.title, shape);
+                        // Taken only if it is actually better. A second wrong
+                        // answer is not an improvement on the first.
+                        if (["ok", "warn"].includes(judge(alt, tagged))) {
+                            r = alt;
+                            askedArtist = tagged;
+                        }
+                    }
+                }
                 // Stamped with the engine that produced it: a cached "nothing
                 // found" is only trustworthy while the thing that looked has
                 // not learned anything new. See IDENTIFY_ENGINE.
-                found[rel] = { state: "done", result: r, engine: IDENTIFY_ENGINE };
+                // `askedArtist` rides along so the judge compares against the
+                // name the provider was ASKED about — the §3.2 rule, which
+                // would otherwise call this record's own match a wrong one.
+                // A lookup that FAILED is not an answer about the record. MB's
+                // 1 req/s limiter makes a 503 routine, and filing one as "done"
+                // made "Murder of the Universe" a permanent deep cut — the
+                // record MB holds, scored 100, and gave up on the next ask.
+                // `persist()` only saves `done`, so an error re-asks; nothing
+                // else here treats the two alike.
+                if (r.incomplete && !r.candidate) {
+                    found[rel] = {
+                        state: "error", result: null,
+                        error: "the provider did not answer — this record has not been looked up yet",
+                    };
+                    return;
+                }
+                found[rel] = { state: "done", result: { ...r, askedArtist }, engine: IDENTIFY_ENGINE };
                 if (r.candidate?.cover) {
                     const rep = await api.importCoverReport(
-                        artist, r.used ?? ask, r.candidate.cover);
+                        askedArtist, r.used ?? ask, r.candidate.cover);
                     reports[rel] = rep;
                 }
             } catch (e) {
@@ -133,7 +198,10 @@
         const rel = a.rel;
         if (localArts[rel] !== undefined) return;
         localArts[rel] = null;
-        api.importLocalArt(sourceRoot, rel).then(
+        // `parts` for the same reason apply takes them: the record's audio is
+        // its own folder and the parts it named, never a walk of what happens
+        // to sit underneath.
+        api.importLocalArt(sourceRoot, rel, a.parts ?? []).then(
             (v) => { localArts[rel] = v; },
             () => {});
     });
@@ -226,7 +294,10 @@
     // an exact hit look doubtful: "Mirrored" against
     // "[WARP CD 156] Battles - Mirrored - 2007" is a containment, so a clean
     // match wore a "!" on its title row.
-    const ev = $derived(matchEvidence(candidate, artist, albumName ?? a.title, a.tracks.length));
+    // Against the artist the provider was ASKED about — which is the folder
+    // unless the tags found the record where the folder could not.
+    const ev = $derived(matchEvidence(
+        candidate, idn?.result?.askedArtist ?? artist, albumName ?? a.title, a.tracks.length));
 
     const verdictLine = $derived.by(() => {
         const c = candidate;
@@ -285,15 +356,57 @@
     const resolvedTag = (k) => choice?.tags?.[k] ?? proposal.tags[k] ?? "yours";
     const resolvedTrack = (n) => choice?.tracks?.[n] ?? "yours";
 
+    /** Row order is the RECORD's order; `n` stays the SCAN's.
+     *
+     *  The scan lists a folder with a plain byte sort (import.rs `paths.sort()`),
+     *  where '0' (0x30) beats '_' (0x5F) — so "10_LONELY WANDERER" precedes
+     *  "1_SEQUENTIAL CIRCUITS" and a record numbered without zero-padding reads
+     *  10, 11, 12, 13, 1, 2 … 9. Pairing that against a provider tracklist by
+     *  position compares track 10 with track 1 the whole way down, and the
+     *  length differences it reports are the arithmetic of that mispairing.
+     *
+     *  Ordering is therefore for DISPLAY ONLY. `n` remains each track's index
+     *  in `a.tracks`, because that is the index apply writes by: `track_titles`
+     *  is positional against apply's own `f.sort()` of the same folder
+     *  (import.rs:1238). Reordering `a.tracks` itself would move the review
+     *  without moving apply, and land every chosen title on the wrong file.
+     *
+     *  A folded release is left in the order the fold built: its tracks are in
+     *  PART order and every part numbers its own tracks from 1, so ordering the
+     *  flattened list by track number would interleave the discs — the trap
+     *  import.rs:1235 and import-fold.js:172 both already guard. */
+    const trackRows = $derived.by(() => {
+        const rows = a.tracks.map((t, n) => ({ t, n }));
+        if ((a.parts?.length ?? 0) > 1) return rows;
+        // The tags decide when they ALL carry a distinct number: a rarities
+        // folder where every file claims track 1 orders by nothing, and a
+        // partial set would sort the numbered ahead of the unnumbered.
+        const nos = rows.map((r) => r.t.trackNo);
+        if (nos.every((x) => typeof x === "number" && x > 0)
+            && new Set(nos).size === nos.length) {
+            return [...rows].sort((x, y) => x.t.trackNo - y.t.trackNo);
+        }
+        // Otherwise the filename, compared with its digit runs as NUMBERS —
+        // which is the same comparison the fold already uses to order parts.
+        return [...rows].sort((x, y) => x.t.name.localeCompare(
+            y.t.name, undefined, { numeric: true, sensitivity: "base" }));
+    });
+
+    /** What the file calls the track. The tag first — it is the thing apply
+     *  writes and compares — falling back to the filename for a file carrying
+     *  no title at all. */
+    const titleOfTrack = (t) => (t.title ?? "").trim()
+        || t.name.replace(/\.[a-z0-9]+$/i, "").replace(/^\d+\s*[-.]\s*/, "");
+
     const trackPairs = $derived.by(() => {
         const theirs = candidate?.tracklist ?? [];
-        return a.tracks.map((t, n) => {
-            const mine = t.name.replace(/\.[a-z0-9]+$/i, "").replace(/^\d+\s*[-.]\s*/, "");
-            const their = theirs[n];
+        return trackRows.map(({ t, n }, row) => {
+            const mine = titleOfTrack(t);
+            const their = theirs[row];
             const dY = t.seconds ?? null;
             const dT = their?.secs ?? null;
             const drift = dY && dT ? Math.abs(dY - dT) : null;
-            return { n, mine, their: their?.title ?? null, dY, dT, drift,
+            return { n, row, mine, their: their?.title ?? null, dY, dT, drift,
                 aligned: drift !== null && drift <= 2 };
         });
     });
@@ -542,8 +655,15 @@
         const tags = {};
         for (const [k, , theirs] of tagPairs)
             if (resolvedTag(k) === "theirs" && theirs) tags[k] = theirs;
-        const trackTitles = trackPairs.map((p) =>
-            p.their && resolvedTrack(p.n) === "theirs" ? p.their : null);
+        // Built by SCAN index, never by row: apply matches `trackTitles`
+        // position-for-position against its own sorted file list
+        // (import.rs:1238), and the rows above are ordered for reading. Writing
+        // this in row order would land every chosen title on the wrong file —
+        // silently, and on the user's actual music.
+        const trackTitles = a.tracks.map(() => null);
+        for (const p of trackPairs) {
+            if (p.their && resolvedTrack(p.n) === "theirs") trackTitles[p.n] = p.their;
+        }
         onSnapshot({ artUrl, tags, trackTitles, audio, audioTracks });
     });
 </script>
@@ -718,7 +838,9 @@
         <div class="im-ab-find">
             <button class="pill ghost" disabled={audition?.status === "searching"} onclick={onFindCopy}>Find a better copy</button>
             <small>{audition?.status === "none"
-                ? "No peer offered this album just now — worth asking again another day."
+                ? audition.silent
+                    ? "Soulseek answered nothing at all — the server refuses some queries outright, and quiet spells happen. Worth asking again."
+                    : "No peer offered this album just now — worth asking again another day."
                 : audition?.status === "failed"
                   ? "The peer stopped answering — try the search again."
                   : "Searches Soulseek for this whole album; the best copy found downloads into the cache so you hear and compare the real thing before choosing."}</small>
@@ -864,7 +986,7 @@
             <div class="im-tl-h">{candidate.source}</div>
             <div class="im-tl-h"></div>
             {#each trackPairs as p (p.n)}
-                <div class="im-tl-n">{p.n + 1}</div>
+                <div class="im-tl-n">{p.row + 1}</div>
                 <button class="im-tag-side" class:on={resolvedTrack(p.n) === "yours"}
                     onclick={() => onChoose({ tracks: { [p.n]: "yours" } })}>{p.mine}</button>
                 <button class="im-tag-side" class:on={resolvedTrack(p.n) === "theirs"}

src/components/ImportToast.svelte

@@ -55,6 +55,8 @@
                     <span>Imported <b>{nfmt(importStatus.done)} records</b>{importStatus.label
                         ? ` · ${importStatus.label}` : ""}</span>
                 {/if}
+            {:else if importStatus.error}
+                <span>{importStatus.error} <b>Click to fix</b></span>
             {:else}
                 <span>The import hit a problem — <b>click to see</b></span>
             {/if}

src/components/ImportWindow.svelte

@@ -29,6 +29,11 @@
 
     let step = $state("source");
     let root = $state(null);        // the folder being imported
+    // Where `root` sits relative to the LIBRARY folder. An absolute path is
+    // only true on the machine that wrote it; this is what survives the drive
+    // being carried somewhere else and coming back at another letter.
+    let rootRel = $state(null);
+    let rootMissing = $state(false); // saved source folder could not be found
     let dest = $state(null);        // { dir, freeBytes, layout } from the backend
     let scan = $state(null);        // ScanResult
     let scanProg = $state(null);    // latest per-file tick; running totals ride along
@@ -93,7 +98,7 @@
                     return [rel, rest];
                 }));
             await api.importSessionSet(JSON.stringify({
-                step, root, scan, layout: layoutChoice, choices, found: done, pick, pickRel,
+                step, root, rootRel, scan, layout: layoutChoice, choices, found: done, pick, pickRel,
                 bucket, bucketRel, auditions: auditionsToSave, keepSeparate,
             }));
         } catch (e) {
@@ -108,8 +113,29 @@
             if (!raw) return;
             const v = JSON.parse(raw);
             if (v?.root) {
-                root = v.root;
+                // The saved path first — nothing has moved in the common case.
+                // Then the same folder relative to where the library is NOW,
+                // which is how a review saved at one machine finds its source
+                // again at another. Both `root` and the scan's own copy are
+                // repointed: apply passes `scan.root`, so leaving that stale
+                // would resume onto a folder that is not there.
+                // NOT `found` — that name is the identify-results state, and
+                // shadowing it here throws on the assignment further down.
+                const liveRoot = await api
+                    .importResolveRoot(v.root, v.rootRel ?? null)
+                    .catch(() => null);
+                root = liveRoot ?? v.root;
+                // A session saved before the portable form existed learns it
+                // now, while its source is still findable — waiting until the
+                // next save would strand any review already in progress.
+                rootRel = v.rootRel
+                    ?? (liveRoot ? await api.importPortableRoot(liveRoot).catch(() => null) : null);
+                rootMissing = !liveRoot;
                 scan = v.scan ?? null;
+                if (scan && liveRoot) scan.root = liveRoot;
+                // Learned or repointed: write it back now rather than waiting
+                // for a transition that may never come.
+                const learned = rootRel !== (v.rootRel ?? null) || root !== v.root;
                 layoutChoice = v.layout ?? null;
                 choices = v.choices ?? {};
                 found = v.found ?? {};
@@ -123,6 +149,7 @@
                 auditions = v.auditions ?? {};
                 keepSeparate = v.keepSeparate ?? [];
                 step = v.step === "scanning" ? "source" : (v.step ?? "source");
+                if (learned) schedulePersist();
             }
         } catch (e) {
             console.warn("import: session restore failed", e);
@@ -161,8 +188,7 @@
     // The dev seed ({ root } form) still overrides the source on open.
     $effect(() => {
         if (open && typeof ui.importOpen === "object" && ui.importOpen?.root) {
-            root = ui.importOpen.root;
-            scan = null;
+            setRoot(ui.importOpen.root);
             step = "source";
         }
     });
@@ -206,9 +232,18 @@
     }
 
     // ---- source ----------------------------------------------------------
+    /** Every route to a source folder goes through here, so the portable form
+     *  is recorded at the same moment as the absolute one and cannot drift. */
+    async function setRoot(p) {
+        root = p;
+        scan = null;
+        rootMissing = false;
+        rootRel = p ? await api.importPortableRoot(p).catch(() => null) : null;
+    }
+
     async function pickSource() {
         const p = await api.pickFolder().catch(() => null);
-        if (p) { root = p; scan = null; }
+        if (p) await setRoot(p);
     }
 
     async function pickDest() {
@@ -473,7 +508,9 @@
             else
                 k = matchEvidence(
                     f.result.candidate,
-                    artistOf.get(x.rel) ?? x.artistFolder,
+                    // The artist the answer was found under — the folder,
+                    // unless the tags found what the folder could not.
+                    f.result.askedArtist ?? artistOf.get(x.rel) ?? x.artistFolder,
                     albumOf.get(x.rel) ?? x.title,
                     x.tracks.length,
                 ).verdict;
@@ -708,6 +745,125 @@
         }
     }
 
+    /** Ask again for the tracks a found copy still owes us.
+     *
+     *  Transfers do not survive the app; the files they wrote do. So a session
+     *  restored after a crash, a power cut or an ordinary restart brings back
+     *  an audition that LOOKS live and is not: `restStarted` is already true,
+     *  so nothing ever asks for the tracks that never landed, and every future
+     *  apply refuses the record for the same reason — "the found copy is still
+     *  arriving" — with nothing arriving. Two records sat at 12 of 13 and 6 of
+     *  11 that way.
+     *
+     *  The pen decides how far it got, not the counter: `arrived` is a running
+     *  total kept by events, and those events stopped with the process that
+     *  was listening for them. A count that was already right costs one stat
+     *  per file to confirm; a count that was wrong is corrected before it can
+     *  refuse anything again.
+     *
+     *  Asked at most once per record per run. A peer that has gone away should
+     *  cost one round of requests, not a fresh one every time the record is
+     *  looked at — "Try another peer" is the answer to that, and it is a
+     *  deliberate act. */
+    const resumeAsked = new Set();
+    async function resumeAudition(rel) {
+        const au = auditions[rel];
+        if (!au || resumeAsked.has(rel)) return;
+        const files = au.candidate?.files ?? [];
+        if (!files.length || ["searching", "none", "failed"].includes(au.status)) return;
+        resumeAsked.add(rel);
+        const peer = au.candidate.username;
+        let missing;
+        try {
+            missing = await api.importAuditionMissing(
+                rel,
+                files.map((f) => ({ path: f.path, size: f.size ?? 0 })),
+            );
+        } catch (e) {
+            console.warn("import: could not read the pen", e);
+            resumeAsked.delete(rel);
+            return;
+        }
+        // Anything could have happened across the await — a switch to another
+        // peer, a fresh search. Credit this answer only to the copy it is about.
+        const cur = auditions[rel];
+        if (!cur || cur.candidate?.username !== peer) return;
+        cur.expected = files.length;
+        cur.arrived = files.length - missing.length;
+        // WHICH files are owed, not just how many — the strip states a size
+        // only when it knows exactly which files make it up.
+        cur.missingIdx = missing;
+        if (!missing.length) {
+            // Everything is already here. The record was refused by a stale
+            // number, and nothing needs downloading to unstick it.
+            cur.status = "complete";
+            schedulePersist();
+            return;
+        }
+        for (const i of missing) {
+            try {
+                const { ids } = await startAudition(rel, cur.candidate, { from: i, count: 1 });
+                cur.ids = [...(cur.ids ?? []), ...ids];
+            } catch (e) {
+                console.warn("import: could not re-request a missing track", e);
+                break;
+            }
+        }
+        cur.status = cur.track1Path ? "ready" : "downloading";
+        cur.xfer = { ...(cur.xfer ?? {}), phase: "requested", at: Date.now() };
+        schedulePersist();
+    }
+
+    /** Ask again for every refusal that is a found copy still owed tracks.
+     *
+     *  Called from BOTH applies. They refuse the same way and have to recover
+     *  the same way: wiring only the full one left the picker's partial apply
+     *  — the one that runs when you import from the review itself — repeating
+     *  "it imports as soon as the rest land" over records nothing was asking
+     *  for. No-ops on a refusal that is not about an audition. */
+    function resumeRefused(skipped) {
+        for (const s of skipped ?? []) resumeAudition(s.rel);
+    }
+
+    // Opening a record is when we find out whether its found copy is still
+    // owed anything — and the only moment a resumed transfer has somewhere to
+    // be seen. Deliberately not a sweep at window-open: that would put a
+    // dozen peers' worth of requests on the wire for records nobody is
+    // looking at. The refused set after an apply is handled there.
+    $effect(() => {
+        if (step !== "upgrades" || !open) return;
+        const rel = curPick?.rel;
+        const au = rel ? auditions[rel] : null;
+        const want = au?.candidate?.files?.length ?? 0;
+        if (!want || (au.arrived ?? 0) >= (au.expected ?? want)) return;
+        resumeAudition(rel);
+    });
+
+    /** Throw away what the abandoned peer left in the pen.
+     *
+     *  The cancel stops its transfers; this removes what they already wrote.
+     *  The pen is keyed by RECORD, not by peer, so without it the dropped
+     *  copy's files sit beside the replacement's until the session is cleared
+     *  — 189 MB of a stranger's Centipede Hz did exactly that, and apply filed
+     *  all 17 tracks. Apply takes the chosen copy's files by name now, so this
+     *  is about disk rather than correctness; the ORDER still matters, because
+     *  a file written after the clear would be a stray nothing asked for.
+     *
+     *  Deliberately unconditional: "another peer" means this copy is not the
+     *  one, and a partial copy of a rip you have walked away from is not worth
+     *  the gigabytes. The automatic switch only fires before track 1 lands, so
+     *  it can never discard more than one unfinished file. */
+    async function clearPen(rel, why) {
+        try {
+            const freed = await api.importAuditionClear(rel);
+            if (freed) {
+                console.info(`import: pen cleared for ${rel} — ${Math.round(freed / 1e6)} MB (${why})`);
+            }
+        } catch (e) {
+            console.warn("import: could not clear the pen", e);
+        }
+    }
+
     /** Stop waiting on this peer and drop to the next ranked copy.
      *
      *  Cancels the transfers first — without that, a switch left the old peer
@@ -721,6 +877,7 @@
         for (const id of au.ids ?? []) {
             try { await api.cancelDownload(id); } catch {}
         }
+        await clearPen(rel, reason ?? "peer switched");
         const [next, ...rest] = au.alts ?? [];
         if (!next) {
             auditions[rel] = { status: "none", dead, exhausted: true, reason };
@@ -751,10 +908,13 @@
         for (const id of prev?.ids ?? []) {
             try { await api.cancelDownload(id); } catch {}
         }
+        // A fresh search abandons the current copy just as squarely as a
+        // switch does; whatever answers will be a different peer's rip.
+        if (prev?.candidate) await clearPen(rel, "searched again");
         auditions[rel] = { status: "searching", dead };
         try {
             const trusted = ["ok", "warn"].includes(bucketByRel.get(rel));
-            const list = await findAlbumCopies({
+            const { copies, silent } = await findAlbumCopies({
                 artist: pickerArtist(x),
                 // The record's own name leads; its folder is the narrower
                 // fallback for when the tags are wrong or absent.
@@ -763,15 +923,18 @@
                 candidate: trusted ? found[rel]?.result?.candidate : null,
                 wantTracks: x.tracks.length,
             });
-            if (!list.length) {
-                auditions[rel] = { status: "none", dead };
+            if (!copies.length) {
+                // `silent` separates "the network never answered" from "peers
+                // answered and none had it" — they read identically on the
+                // card otherwise, and the first one is not about this record.
+                auditions[rel] = { status: "none", dead, silent };
                 schedulePersist();
                 return;
             }
             await beginAudition(
                 rel,
-                slimCandidate(list[0]),
-                list.slice(1, 1 + AUDITION_ALTS).map(slimCandidate),
+                slimCandidate(copies[0]),
+                copies.slice(1, 1 + AUDITION_ALTS).map(slimCandidate),
                 { dead },
             );
         } catch (e) {
@@ -812,6 +975,7 @@
         if (p.id != null && (au.dead ?? []).includes(p.id)) return;
         if (p.done) {
             au.arrived = (au.arrived ?? 0) + 1;
+            if (au.missingIdx) au.missingIdx = au.missingIdx.filter((i) => i !== idx);
             if (idx === 0) {
                 au.track1Path = p.localPath;
                 au.status = "ready";
@@ -900,6 +1064,105 @@
         };
     }
 
+    /* ---- what the upgrade step is still waiting on ---------------------- */
+
+    /** Records whose found copy is not fully in the pen yet, plus ones that
+     *  ARE and have not been imported — a finished copy belongs here too,
+     *  because it is the thing standing between you and pressing Import.
+     *
+     *  Deliberately not "every audition": a record you listened to and then
+     *  kept your own copy of is not something you are waiting for. */
+    const arrivals = $derived(
+        Object.entries(auditions)
+            .flatMap(([rel, au]) => {
+                const files = au?.candidate?.files ?? [];
+                const want = au?.expected ?? files.length;
+                if (!files.length || !want) return [];
+                const have = Math.max(0, Math.min(au.arrived ?? 0, want));
+                const owed = want - have;
+                const theirs = choices[rel]?.audio === "theirs";
+                if (choices[rel]?.applied || (!owed && !theirs)) return [];
+                // Bytes only when the pen check told us WHICH files are owed.
+                // Owed-count times an average would be a number that looks
+                // measured and is not.
+                const idx = au.missingIdx;
+                return [{
+                    rel, au, want, have, owed, theirs,
+                    name: rel.split(/[\\/]/).pop() || rel,
+                    peer: au.candidate.username,
+                    live: liveOf(au),
+                    bytes: idx ? idx.reduce((n, i) => n + (files[i]?.size ?? 0), 0) : null,
+                }];
+            })
+            .sort((a, b) => b.owed - a.owed || a.name.localeCompare(b.name)));
+
+    const arrivalsOwed = $derived(arrivals.filter((a) => a.owed > 0));
+    const arrivalFiles = $derived(arrivalsOwed.reduce((n, a) => n + a.owed, 0));
+    const arrivalStalled = $derived(arrivalsOwed.some((a) => a.live?.stalled));
+    const arrivalBytes = $derived(
+        arrivalsOwed.length && arrivalsOwed.every((a) => a.bytes != null)
+            ? arrivalsOwed.reduce((n, a) => n + a.bytes, 0) : null);
+    let trayOpen = $state(false);
+
+    /** What one row says, in the language the picker already uses. Nothing
+     *  here invents a state: every branch is something the transfer events
+     *  actually said, or the plain absence of them — after a restart there is
+     *  no `xfer` at all, and "asked, no answer yet" is the truth then. */
+    function arrivalWords(a) {
+        if (!a.owed) return { cls: "ok", label: `all ${a.want} cached`, detail: "ready to import" };
+        const x = a.live;
+        if (x?.stalled) {
+            const mins = Math.max(1, Math.round((x.quietMs ?? 0) / 60000));
+            return { cls: "stall", label: `nothing for ${mins} min`, detail: `${a.peer} stopped sending` };
+        }
+        if (x?.phase === "transferring") {
+            const mbs = (x.speedBps ?? 0) / 1e6;
+            return { cls: "move", label: "arriving", detail: mbs >= 0.05 ? `${mbs.toFixed(1)} MB/s` : "slowly" };
+        }
+        if (x?.place != null || x?.phase === "queued") {
+            return {
+                cls: "wait", label: `queued at ${a.peer}`,
+                detail: x.place != null ? `${nfmt(x.place)} ahead of you` : "nothing moving yet",
+            };
+        }
+        return { cls: "wait", label: `asked ${a.peer}`, detail: "no answer yet" };
+    }
+
+    /** The container is what the peer sent, the depth and bitrate are what the
+     *  probe MEASURED of the file that landed. */
+    function arrivalFormat(a) {
+        const first = a.au.candidate.files?.[0];
+        const ext = String(first?.name ?? first?.path ?? "").split(".").pop().toUpperCase();
+        const p = a.au.probe;
+        if (a.au.candidate.lossless === a.au.candidate.trackCount) {
+            return p?.bitDepth ? `${ext} ${p.bitDepth}-bit` : ext;
+        }
+        const k = p?.bitrate ?? a.au.candidate.avgBitrate;
+        return k ? `${ext} ${nfmt(k)}k` : ext;
+    }
+
+    const arrivalInitials = (name) =>
+        name.replace(/^.*?[-–—]\s*/, "").split(/\s+/).slice(0, 2).map((w) => w[0] ?? "").join("").toUpperCase();
+
+    /** Jump the picker to a record in the tray. The lens can be narrower than
+     *  the tray — a record filtered out of the current bucket is still one you
+     *  are waiting for — so widen rather than fail silently. */
+    function goToArrival(rel) {
+        if (!seekTo(rel)) {
+            bucket = "all";
+            seekTo(rel);
+        }
+        trayOpen = false;
+        schedulePersist();
+    }
+
+    /** Refusals the tray is not already speaking for. A record whose found
+     *  copy is still arriving is IN the tray — live, with the peer and the
+     *  count — and saying it again in the past tense above is the same fact
+     *  twice, the staler of the two winning the eye. */
+    const leftBehind = $derived(
+        (report?.skipped ?? []).filter((s) => !arrivals.some((a) => a.rel === s.rel)));
+
     /** The picker's resolved snapshot — what apply writes. Stored beside the
      *  choices but NOT a "seen": looking is not deciding. */
     function snapshot(rel, snap) {
@@ -1182,6 +1445,12 @@
                 if (c && !refused.has(rel)) c.applied = true;
             if (refused.size) {
                 await persist();
+                // A refusal is usually "the found copy is short", and the copy
+                // is short because a transfer died. Ask for the rest NOW, so
+                // "it imports as soon as the rest land" is something that can
+                // actually happen — otherwise the next run refuses the same
+                // records for the same reason, forever.
+                resumeRefused(report.skipped);
             } else {
                 await api.importSessionClear().catch(() => {});
                 importResume.active = false;
@@ -1221,6 +1490,17 @@
                         // copy out of the source folder.
                         audio: r.audio === "theirs" ? "theirs" : null,
                         audioTracks: r.audio === "theirs" ? (r.audioTracks ?? null) : null,
+                        // WHICH files the chosen copy is made of. The pen is
+                        // keyed by RECORD, not by peer, so a record that
+                        // changed peers has both copies sitting in it — the
+                        // abandoned peer's transfers were cancelled, but the
+                        // files they had already written stayed. Apply took
+                        // everything in the folder and filed Centipede Hz as
+                        // 17 tracks: deletia's 11 plus the 6 smash2 had
+                        // managed before it was dropped.
+                        audioFiles: r.audio === "theirs"
+                            ? (auditions[p.rel]?.candidate?.files ?? []).map((f) => f.path)
+                            : null,
                     },
                 };
             });
@@ -1231,7 +1511,17 @@
      *  doesn't redo them. The eventual full apply still covers everything —
      *  idempotent copies make the banked files no-ops. */
     async function applyPartial() {
-        if (!dest?.dir || applying || !scan) return;
+        // Banking on the way out must never fail in silence. Closing the
+        // picker after deciding 25 records and finding nothing in the library —
+        // with no toast, no error and nothing in the log — is what a bare
+        // `return` here looks like from the outside.
+        if (applying || !scan) return;
+        if (!dest?.dir) {
+            importStatus.phase = "error";
+            importStatus.error = "No library folder is set, so nothing could be imported.";
+            console.warn("import: banking skipped — no destination");
+            return;
+        }
         const seen = new Set(Object.entries(choices)
             .filter(([, c]) => c?.seen && !c.applied).map(([r]) => r));
         if (!seen.size) return;
@@ -1255,6 +1545,7 @@
             const refused = new Set((rep.skipped ?? []).map((s) => s.rel));
             for (const r of seen)
                 if (choices[r] && !refused.has(r)) choices[r].applied = true;
+            resumeRefused(rep.skipped);
             importStatus.done = rep.albums;
             importStatus.label = fmtGB(rep.bytes);
             importStatus.skipped = refused.size;
@@ -1297,6 +1588,8 @@
         }
         step = "source";
         root = null;
+        rootRel = null;
+        rootMissing = false;
         scan = null;
         scanProg = null;
         scanEta = null;
@@ -1364,14 +1657,14 @@
                  show it on, so without this the only trace of a refusal was
                  a toast reading "Imported 0 records". Not dismissible while
                  it is still true — it clears itself when they import. -->
-            {#if step !== "done" && report?.skipped?.length}
+            {#if step !== "done" && leftBehind.length}
                 <div class="im-left">
-                    <b>{nfmt(report.skipped.length)} record{report.skipped.length === 1 ? "" : "s"}
-                        {report.skipped.length === 1 ? "was" : "were"} not imported.</b>
-                    Nothing was written for {report.skipped.length === 1 ? "it" : "them"} and
-                    {report.skipped.length === 1 ? "it is" : "they are"} still on the list —
+                    <b>{nfmt(leftBehind.length)} record{leftBehind.length === 1 ? "" : "s"}
+                        {leftBehind.length === 1 ? "was" : "were"} not imported.</b>
+                    Nothing was written for {leftBehind.length === 1 ? "it" : "them"} and
+                    {leftBehind.length === 1 ? "it is" : "they are"} still on the list —
                     importing again once the reason below is gone will pick
-                    {report.skipped.length === 1 ? "it" : "them"} up.
+                    {leftBehind.length === 1 ? "it" : "them"} up.
                     <div class="im-left-rows">
                         <!-- The FOLDER, not the tag album name: this record's
                              tags call it "user48736353001", which names
@@ -1397,7 +1690,13 @@
                         <div class="im-drop-t">
                             <div class="im-drop-h">The music — read from</div>
                             <div class="im-path">{root ?? "Choose a folder…"}</div>
-                            {#if scan}
+                            {#if rootMissing}
+                                <!-- A resumed review whose source could not be
+                                     found: say so HERE, where the folder is
+                                     named, rather than letting apply fail on
+                                     a path the review still displays. -->
+                                <small class="missing">this folder isn't here — choose where it lives now</small>
+                            {:else if scan}
                                 <small>{nfmt(totals.albums)} folders · {nfmt(totals.tracks)} files ·
                                     {fmtGB(totals.bytes)} · scanned</small>
                             {:else if root}
@@ -1638,7 +1937,83 @@
                             {label}<i>{nfmt(n)}</i>
                         </button>
                     {/each}
+                    <!-- Not a lens: the outcome chips choose what the picker
+                         WALKS, this one discloses what the found copies still
+                         owe. It rides here because it belongs to the same
+                         glance, and it costs no space at all when nothing is
+                         owed — which is the normal case. -->
+                    {#if arrivals.length}
+                        <button class="im-bucket ar-chip" class:stalled={arrivalStalled}
+                            aria-expanded={trayOpen}
+                            onclick={() => (trayOpen = !trayOpen)}
+                            title={arrivalFiles
+                                ? "What the found copies still owe"
+                                : "Copies cached and waiting to be imported"}>
+                            {#if arrivalFiles}<span class="ar-dot"></span>{/if}
+                            {arrivalStalled ? "Stalled" : arrivalFiles ? "Arriving" : "Arrived"}
+                            <i>{nfmt(arrivalFiles || arrivals.length)}</i>
+                        </button>
+                    {/if}
                 </div>
+                {#if trayOpen && arrivals.length}
+                    <div class="ar-tray" class:stalled={arrivalStalled} class:done={!arrivalFiles}>
+                        <div class="ar-h">
+                            {#if !arrivalFiles}
+                                <b>Everything arrived.</b>
+                                {arrivals.length === 1 ? "This copy is" : `All ${nfmt(arrivals.length)} copies are`}
+                                cached — importing now takes {arrivals.length === 1 ? "it" : "them"}.
+                            {:else if arrivalStalled}
+                                <b>Stalled.</b> {nfmt(arrivalFiles)} file{arrivalFiles === 1 ? "" : "s"}
+                                still owed, and nothing is moving.
+                            {:else}
+                                <b>Still arriving.</b> {nfmt(arrivalsOwed.length)}
+                                record{arrivalsOwed.length === 1 ? "" : "s"} ·
+                                {nfmt(arrivalFiles)} file{arrivalFiles === 1 ? "" : "s"}{#if arrivalBytes} ·
+                                    {nfmt(Math.round(arrivalBytes / 1e6))} MB to come{/if}.
+                            {/if}
+                        </div>
+                        <div class="ar-rows">
+                            {#each arrivals as a (a.rel)}
+                                {@const w = arrivalWords(a)}
+                                <div class="ar-row">
+                                    <div class="ar-art" class:ok={!a.owed}>{arrivalInitials(a.name)}</div>
+                                    <div class="ar-nm">
+                                        <b title={a.rel}>{a.name}</b>
+                                        <div class="ar-meta">
+                                            <div class="im-bar" class:live={a.owed > 0 && a.live?.phase === "transferring"}>
+                                                <i style:width="{Math.round((a.have / a.want) * 100)}%"></i>
+                                            </div>
+                                            <span>{nfmt(a.have)} of {nfmt(a.want)} cached</span>
+                                            <span>·</span><span>{arrivalFormat(a)}</span>
+                                            <b class="ar-state {w.cls}">{w.label}</b>
+                                            <span>{w.detail}</span>
+                                        </div>
+                                    </div>
+                                    <div class="ar-acts">
+                                        <button class="pill ghost" onclick={() => goToArrival(a.rel)}>Go to record</button>
+                                        {#if a.owed}
+                                            <button class="pill ghost"
+                                                onclick={() => switchPeer(a.rel, "you asked for another peer")}
+                                            >Try another peer</button>
+                                        {/if}
+                                    </div>
+                                </div>
+                            {/each}
+                        </div>
+                        <div class="ar-foot">
+                            {#if arrivalFiles}
+                                Nothing here needs you — they import themselves on the next run once the
+                                files land. "Keep mine" on the record takes your own copy instead.
+                            {:else}
+                                <!-- The picker's own bank, not the full run:
+                                     it applies what has been decided and not
+                                     yet written, which is exactly these. -->
+                                <button class="pill" onclick={applyPartial} disabled={applying}>
+                                    Import {nfmt(arrivals.length)} record{arrivals.length === 1 ? "" : "s"}</button>
+                            {/if}
+                        </div>
+                    </div>
+                {/if}
                 {#if curPick}
                     {#key curPick.rel}
                         <ImportPicker
@@ -2117,6 +2492,72 @@
     .im-bucket[data-out="bad"]:not([disabled]):not([aria-selected="true"]) { color: #f19292; }
     .im-bucket:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
 
+    /* ---- what the found copies still owe ------------------------------
+       The chip rides in the outcome row but is NOT one of them: the others
+       choose what the picker walks, this one discloses a state. Accent fill
+       and a pulse say so, and it is absent entirely when nothing is owed. */
+    .im-bucket.ar-chip {
+        background: color-mix(in srgb, var(--accent) 26%, rgba(10, 10, 12, 0.5));
+        color: #fff;
+        box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent);
+    }
+    .im-bucket.ar-chip:hover {
+        background: color-mix(in srgb, var(--accent) 34%, rgba(10, 10, 12, 0.5));
+    }
+    .im-bucket.ar-chip.stalled {
+        background: rgba(233, 185, 73, 0.2); color: #f0cd77;
+        box-shadow: inset 0 0 0 1px rgba(233, 185, 73, 0.4);
+    }
+    .ar-dot {
+        width: 6px; height: 6px; border-radius: 50%; background: currentColor;
+        animation: ar-pulse 1.4s ease-in-out infinite;
+    }
+    @keyframes ar-pulse { 50% { opacity: 0.25; } }
+
+    .ar-tray {
+        position: relative; z-index: 1;
+        margin: -6px 0 16px; padding: 11px 13px; border-radius: var(--radius);
+        max-width: 96ch;
+        background: rgba(0, 0, 0, 0.28);
+        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07);
+    }
+    .ar-h {
+        display: flex; align-items: baseline; gap: 9px;
+        font-size: 12.5px; line-height: 1.5; color: var(--text-secondary);
+    }
+    .ar-h b { color: color-mix(in srgb, var(--accent) 55%, #fff); font-weight: 800; }
+    .ar-tray.stalled .ar-h b { color: #f0cd77; }
+    .ar-tray.done .ar-h b { color: #7fe0a4; }
+    .ar-rows { margin-top: 9px; display: flex; flex-direction: column; gap: 7px; }
+    .ar-row {
+        display: grid; grid-template-columns: 34px 1fr auto; gap: 11px; align-items: center;
+        padding: 8px 9px; border-radius: 6px; background: rgba(255, 255, 255, 0.03);
+    }
+    .ar-art {
+        width: 34px; height: 34px; border-radius: 4px; display: grid; place-items: center;
+        font-size: 10px; font-weight: 800; color: rgba(255, 255, 255, 0.78);
+        background: color-mix(in srgb, var(--accent) 30%, rgba(255, 255, 255, 0.06));
+    }
+    .ar-art.ok { background: rgba(127, 224, 164, 0.22); }
+    .ar-nm { min-width: 0; }
+    .ar-nm > b {
+        display: block; font-size: 13px; font-weight: 700;
+        white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
+    }
+    .ar-meta {
+        display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
+        margin-top: 3px; font-size: 11.5px; color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+    }
+    .ar-meta .im-bar { width: 120px; flex: none; }
+    .ar-state { font-weight: 700; }
+    .ar-state.wait { color: var(--text-secondary); }
+    .ar-state.move { color: color-mix(in srgb, var(--accent) 60%, #fff); }
+    .ar-state.stall { color: #f0cd77; }
+    .ar-state.ok { color: #7fe0a4; }
+    .ar-acts { display: flex; gap: 6px; align-items: center; }
+    .ar-foot { margin-top: 9px; font-size: 11.5px; color: var(--text-muted); line-height: 1.5; }
+
     /* Left behind, not broken — amber, the picker's .im-tl-warn language. */
     .im-left {
         margin-bottom: 16px; padding: 11px 13px; border-radius: var(--radius);
@@ -2137,6 +2578,9 @@
     }
     .im-reset b { color: #f0a0a0; }
     .im-reset-row { margin-top: 10px; display: flex; gap: 8px; }
+    /* The source folder a resumed review could not find. Amber, not red: it
+       reports something that happened rather than asking to destroy anything. */
+    .im-drop-t small.missing { color: rgb(232, 178, 96); }
     .pill.danger { background: rgba(233, 90, 90, 0.9); color: #1a0d0d; }
     .pill.danger:hover { background: rgba(233, 90, 90, 1); }
 
@@ -2177,5 +2621,6 @@
     @media (prefers-reduced-motion: reduce) {
         .im-bar.live i { animation: none; }
         .led-pulse { animation: none; }
+        .ar-dot { animation: none; }
     }
 </style>

src/components/LyricsOverlay.svelte

@@ -0,0 +1,104 @@
+<script>
+    // Fullscreen lyrics: the whole window washed in the playing record's
+    // accent, the same LyricsPane rendered at reading-room scale. Opened from
+    // the pane's expand button; Escape or ✕ returns to the app.
+    import { ui, player, theme } from "../lib/state.svelte.js";
+    import LyricsPane from "./LyricsPane.svelte";
+    import Icon from "./Icon.svelte";
+
+    const artist = $derived.by(() => {
+        const track = player.track;
+        if (!track) return "";
+        return (track.artist ?? "").trim() || String(track.sub ?? "").split(" — ")[0].trim();
+    });
+
+    function onkeydown(e) {
+        if (e.key === "Escape") ui.lyricsFull = false;
+    }
+
+    // Close with the track when playback stops entirely — a lyrics room with
+    // nothing playing is a dead end.
+    $effect(() => {
+        if (ui.lyricsFull && !player.track) ui.lyricsFull = false;
+    });
+</script>
+
+<svelte:window onkeydown={ui.lyricsFull ? onkeydown : undefined} />
+
+{#if ui.lyricsFull}
+    <div class="room" style="--wash: {theme.accent}">
+        <header>
+            <div class="who">
+                <p class="t">{player.track?.title ?? ""}</p>
+                {#if artist}<p class="a">{artist}</p>{/if}
+            </div>
+            <button class="close" title="Close (Esc)" onclick={() => (ui.lyricsFull = false)}>
+                <Icon name="shrink" size={18} />
+            </button>
+        </header>
+        <div class="body">
+            <LyricsPane big />
+        </div>
+    </div>
+{/if}
+
+<style>
+    .room {
+        position: fixed;
+        inset: 0;
+        z-index: 90;
+        display: flex;
+        flex-direction: column;
+        background:
+            radial-gradient(120% 90% at 20% 0%, color-mix(in srgb, var(--wash) 32%, transparent), transparent 60%),
+            radial-gradient(120% 90% at 90% 100%, color-mix(in srgb, var(--wash) 14%, transparent), transparent 55%),
+            var(--bg-base);
+    }
+    header {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        padding: 26px 38px 10px;
+        flex: none;
+    }
+    .who {
+        min-width: 0;
+    }
+    .t {
+        font-size: 17px;
+        font-weight: 800;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+    .a {
+        font-size: 13px;
+        color: var(--text-secondary);
+        margin-top: 2px;
+    }
+    .close {
+        display: grid;
+        place-items: center;
+        width: 40px;
+        height: 40px;
+        border-radius: 50%;
+        color: var(--text-secondary);
+        background: rgba(255, 255, 255, 0.06);
+        flex: none;
+    }
+    .close:hover {
+        color: var(--text-primary);
+        background: rgba(255, 255, 255, 0.12);
+    }
+    .body {
+        flex: 1;
+        min-height: 0;
+        display: flex;
+        justify-content: center;
+        padding: 6px 38px 30px;
+    }
+    .body :global(.lyr) {
+        width: min(820px, 100%);
+        height: 100%;
+    }
+</style>

src/components/LyricsPane.svelte

@@ -0,0 +1,911 @@
+<script>
+    // The Now Playing lyrics pane: synced lines that follow playback with the
+    // active line held at SEAT, click-to-seek, a sync nudge, a candidate
+    // picker and a paste door for tracks nothing automatic can cover. Also
+    // rendered by the fullscreen overlay in `big` mode — one component, two
+    // type scales.
+    import { player, ui, playLocalFile } from "../lib/state.svelte.js";
+    import {
+        lyricsStore,
+        lyricIdentity,
+        ensureLyrics,
+        noteTrackChange,
+        activeLineIndex,
+        activeWordIndex,
+        totalOffsetMs,
+        nudgeOffset,
+        setAutoSync,
+        searchCandidates,
+        closeCandidates,
+        chooseCandidate,
+        savePastedLyrics,
+        resetLyrics,
+        openSyncEditor,
+    } from "../lib/lyrics.svelte.js";
+    import { lyricLinesOf } from "../lib/lyric-sync.js";
+    import * as api from "../lib/api.js";
+    import Icon from "./Icon.svelte";
+
+    import { untrack } from "svelte";
+
+    let { big = false } = $props();
+
+    let box = $state(null);
+    let pasting = $state(false);
+    let pasteText = $state("");
+    let menuOpen = $state(false);
+    // While the user is scrolling the box themselves, auto-follow stands
+    // down; it resumes a few seconds after the wheel goes quiet.
+    let holdUntil = 0;
+
+    // Load on mount and again whenever the playing track changes while the
+    // pane is visible. noteTrackChange clears stale lines synchronously, and
+    // an open paste box or menu goes with them — a paste typed for one song
+    // must never be saved under the identity of the next.
+    let shownKey = null;
+    $effect(() => {
+        const identity = lyricIdentity();
+        const key = identity ? `${identity.artist} ${identity.title} ${identity.durationSecs ?? "x"}` : "";
+        if (key !== shownKey) {
+            shownKey = key;
+            pasting = false;
+            pasteText = "";
+            menuOpen = false;
+        }
+        // untrack: ensureLyrics reads AND writes lyricsStore.status/key
+        // synchronously, so tracked it makes a failed fetch retrigger this
+        // effect forever (error → loading → error…) — the exact boundary
+        // NowPlaying's loadDiscovery documents. The effect keys off the
+        // playing IDENTITY alone.
+        untrack(() => {
+            noteTrackChange();
+            void ensureLyrics();
+        });
+    });
+
+    const active = $derived(
+        lyricsStore.status === "synced" ? activeLineIndex(player.position ?? 0) : -1,
+    );
+
+    // ---- instrumental (offline vocal reduction) ----
+    const currentItem = $derived(player.queue?.[player.queueIndex] ?? null);
+    const canInstrumental = $derived(
+        !!currentItem?.path && !currentItem?.stream && lyricsStore.status !== "loading",
+    );
+    let instrumentalBusy = $state(false);
+    let instrumentalNote = $state("");
+    async function playInstrumental() {
+        const item = currentItem;
+        if (instrumentalBusy || !item?.path || item.stream) return;
+        instrumentalBusy = true;
+        instrumentalNote = "";
+        try {
+            const res = await api.lyricsPrepareInstrumental(item.path);
+            // The prepare can take seconds; if the queue moved on meanwhile,
+            // starting the OLD track's instrumental would hijack whatever is
+            // playing now.
+            const current = player.queue?.[player.queueIndex] ?? null;
+            if (current?.path !== item.path) {
+                instrumentalNote = "The track changed while preparing — ready under ⋯ next time.";
+                return;
+            }
+            menuOpen = false;
+            const artist =
+                (item.artist ?? "").trim() || String(item.sub ?? "").split(" — ")[0].trim();
+            // The ORIGINAL title on purpose: the lyric identity stays with the
+            // recording, so the words keep following the instrumental.
+            await playLocalFile(res.path, item.title, `${artist} — instrumental`, item.art ?? null);
+        } catch (e) {
+            instrumentalNote = String(e).replace(/^Error:\s*/, "").slice(0, 140);
+        } finally {
+            instrumentalBusy = false;
+        }
+    }
+
+    // Where the active line is held inside the box: 0 = its top edge, 1 = its
+    // bottom. Above centre on purpose — dead centre spends half the box on
+    // words already sung, and the lead spacer it needed marooned a song's
+    // first lines below a screenful of nothing. The stylesheet's .tail-space
+    // is this value's complement, so the LAST line still reaches the same
+    // seat as every other one.
+    const SEAT = 0.42;
+
+    // Follow the active line, held at SEAT, unless the user is exploring.
+    $effect(() => {
+        const index = active;
+        if (index < 0 || !box || lyricsStore.status !== "synced") return;
+        if (performance.now() < holdUntil) return;
+        const el = box.querySelector(`[data-line="${index}"]`);
+        if (!el) return;
+        // Measured against the BOX, not offsetTop. offsetTop counts from
+        // offsetParent, which here is .pane (its panein keyframes animate a
+        // transform, so Chromium hands it the role) — the toolbar's height
+        // rode along in every target, seating the line ~30px above wherever
+        // the number said. Rects and scrollTop are origin-independent, so
+        // SEAT means what it reads.
+        const top = box.scrollTop + (el.getBoundingClientRect().top - box.getBoundingClientRect().top);
+        const target = top - box.clientHeight * SEAT + el.offsetHeight / 2;
+        box.scrollTo({
+            top: Math.max(0, target),
+            behavior: ui.windowActive ? "smooth" : "auto",
+        });
+    });
+
+    function userScrolled() {
+        holdUntil = performance.now() + 3500;
+    }
+
+    function seekTo(line) {
+        const secs = Math.max(0, (line.time_ms + totalOffsetMs()) / 1000);
+        api.playerControl("seek", secs).catch(() => {});
+        holdUntil = 0;
+    }
+
+    async function submitPaste() {
+        const ok = await savePastedLyrics(pasteText);
+        if (ok) {
+            pasting = false;
+            pasteText = "";
+        }
+    }
+
+    const SOURCE_LABEL = {
+        sidecar: "from a lyrics file",
+        embedded: "from the audio file",
+        lrclib: "via LRCLIB",
+        amll: "via AMLL DB · word-synced",
+        picked: "picked on LRCLIB",
+        user: "pasted by you",
+    };
+
+    function fmtDur(secs) {
+        if (!secs) return "";
+        return `${Math.floor(secs / 60)}:${String(secs % 60).padStart(2, "0")}`;
+    }
+</script>
+
+<div class="lyr" class:big>
+    {#if lyricsStore.status === "loading" || lyricsStore.status === "idle"}
+        <div class="shimmer" aria-hidden="true">
+            <span style="width: 72%"></span>
+            <span style="width: 58%"></span>
+            <span style="width: 81%"></span>
+            <span style="width: 47%"></span>
+        </div>
+    {:else if lyricsStore.candidates !== null}
+        <div class="picker">
+            <div class="pick-head">
+                <span>Choose the right lyrics</span>
+                <button class="tool" title="Close" onclick={closeCandidates}>
+                    <Icon name="x" size={14} />
+                </button>
+            </div>
+            {#if lyricsStore.candidatesLoading}
+                <p class="note">Searching LRCLIB…</p>
+            {:else if lyricsStore.candidates.length === 0}
+                <p class="note">Nothing found for this track name.</p>
+            {:else}
+                <div class="cands">
+                    {#each lyricsStore.candidates as c (c.id)}
+                        <button class="cand" onclick={() => chooseCandidate(c.id)}>
+                            <span class="c-main">
+                                <span class="c-t">{c.title}</span>
+                                <span class="c-a">{c.artist}{c.album ? ` — ${c.album}` : ""}</span>
+                            </span>
+                            {#if c.synced}<span class="c-tag">synced</span>{/if}
+                            {#if c.instrumental}<span class="c-tag inst">instrumental</span>{/if}
+                            <span class="c-d">{fmtDur(c.durationSecs)}</span>
+                        </button>
+                    {/each}
+                </div>
+            {/if}
+        </div>
+    {:else if pasting}
+        <div class="paste">
+            <p class="note">
+                Paste lyrics — plain text, or LRC with <span class="mono">[mm:ss]</span> timestamps
+                for synced display.
+            </p>
+            <textarea bind:value={pasteText} spellcheck="false" placeholder="[00:12.00] First line…"></textarea>
+            <div class="paste-actions">
+                <button class="pbtn ghost" onclick={() => (pasting = false)}>Cancel</button>
+                <button class="pbtn" onclick={submitPaste} disabled={!pasteText.trim()}>Save</button>
+            </div>
+        </div>
+    {:else if lyricsStore.status === "synced"}
+        <div class="toolbar">
+            <span class="src">{SOURCE_LABEL[lyricsStore.source] ?? ""}</span>
+            {#if lyricsStore.autoOffsetMs !== 0}
+                <button
+                    class="autochip"
+                    title="Timing auto-corrected from this file's extra lead-in — click to turn off"
+                    onclick={() => setAutoSync(false)}
+                >
+                    auto {lyricsStore.autoOffsetMs > 0 ? "+" : ""}{(lyricsStore.autoOffsetMs / 1000).toFixed(1)}s
+                </button>
+            {/if}
+            <span class="nudge" title="Shift lyric timing">
+                <button class="tool" title="Lyrics earlier" onclick={() => nudgeOffset(-500)}>−</button>
+                <span class="off" class:on={lyricsStore.offsetMs !== 0}>
+                    {lyricsStore.offsetMs === 0
+                        ? "sync"
+                        : `${lyricsStore.offsetMs > 0 ? "+" : ""}${(lyricsStore.offsetMs / 1000).toFixed(1)}s`}
+                </span>
+                <button class="tool" title="Lyrics later" onclick={() => nudgeOffset(500)}>+</button>
+            </span>
+            {@render tools()}
+        </div>
+        <!-- svelte-ignore a11y_no_static_element_interactions -->
+        <div
+            class="lines"
+            bind:this={box}
+            onwheel={userScrolled}
+            ontouchmove={userScrolled}
+        >
+            <div class="lead-space"></div>
+            {#each lyricsStore.lines as line, index (index)}
+                <button
+                    class="line"
+                    class:on={index === active}
+                    class:past={index < active}
+                    class:gap={!line.text}
+                    data-line={index}
+                    onclick={() => seekTo(line)}
+                    title="Play from here"
+                >
+                    {#if index === active && line.words?.length}
+                        <!-- Real word timing from the source: crisp per-word.
+                             This is the ONLY karaoke mode. A line-level source
+                             gets the whole-line highlight and nothing more —
+                             a sweep interpolated across the line's window
+                             tracked the layout, not the voice (it crawled
+                             through instrumental gaps), so it read as broken.
+                             Word times are carried, never invented (the
+                             Noctis rule). -->
+                        {@const sungTo = activeWordIndex(line, player.position ?? 0)}
+                        <span class="wline">
+                            {#each line.words as word, wi (wi)}
+                                <span class="w" class:sung={wi <= sungTo}>{word.text}</span>
+                            {/each}
+                        </span>
+                    {:else}
+                        {line.text || "· · ·"}
+                    {/if}
+                </button>
+            {/each}
+            <div class="tail-space"></div>
+        </div>
+    {:else if lyricsStore.status === "plain"}
+        <div class="toolbar">
+            <span class="src">{SOURCE_LABEL[lyricsStore.source] ?? ""} · not synced</span>
+            {@render tools()}
+        </div>
+        <button
+            class="syncnow"
+            title="Play the song once and tap each line as it begins"
+            onclick={() => openSyncEditor(lyricLinesOf(lyricsStore.plain))}
+        >
+            <Icon name="clock" size={14} /> Sync these lyrics
+        </button>
+        <!-- The same box, the same type, the same fade as the synced list —
+             a lyric sheet is a lyric sheet whether or not anything timed it.
+             Only the parts that need a clock are absent: no line is lit, and
+             none of them seek. -->
+        <div class="lines plain" bind:this={box}>
+            <div class="lead-space"></div>
+            {#each lyricsStore.plain.split("\n") as pline, i (i)}
+                <p class="line" class:gap={!pline.trim()}>{pline.trim() ? pline : "· · ·"}</p>
+            {/each}
+            <div class="tail-space"></div>
+        </div>
+    {:else if lyricsStore.status === "instrumental"}
+        <div class="statebox">
+            <span class="state-glyph"><Icon name="music" size={26} /></span>
+            <p class="state-t">Instrumental</p>
+            <p class="state-s">Sit back — there are no words to follow.</p>
+        </div>
+    {:else if lyricsStore.status === "error"}
+        <div class="statebox">
+            <p class="state-t">Couldn’t look up lyrics</p>
+            <p class="state-s">Something failed along the way.</p>
+            <button class="pbtn" onclick={() => ensureLyrics(true)}>Try again</button>
+        </div>
+    {:else}
+        <div class="statebox">
+            <p class="state-t">No lyrics found</p>
+            <p class="state-s">
+                Nothing local and no LRCLIB match for this exact recording.
+            </p>
+            <div class="state-actions">
+                <button class="pbtn" onclick={searchCandidates}>
+                    <Icon name="search" size={13} /> Search LRCLIB
+                </button>
+                <button class="pbtn ghost" onclick={() => (pasting = true)}>
+                    <Icon name="file-text" size={13} /> Paste lyrics
+                </button>
+            </div>
+        </div>
+    {/if}
+</div>
+
+{#snippet tools()}
+    <span class="tools">
+        {#if !big}
+            <button class="tool" title="Fullscreen lyrics" onclick={() => (ui.lyricsFull = true)}>
+                <Icon name="expand" size={13} />
+            </button>
+        {/if}
+        <span class="tool-menu">
+            <button
+                class="tool"
+                title="Lyrics options"
+                onclick={(e) => {
+                    e.stopPropagation();
+                    menuOpen = !menuOpen;
+                }}
+            >
+                <Icon name="more-horizontal" size={15} />
+            </button>
+            {#if menuOpen}
+                <!-- svelte-ignore a11y_click_events_have_key_events, a11y_no_noninteractive_element_interactions -->
+                <div class="menu" role="menu" tabindex="-1" onclick={(e) => e.stopPropagation()}>
+                    {#if canInstrumental}
+                        <button class="mi" onclick={playInstrumental} disabled={instrumentalBusy}>
+                            <Icon name="music" size={14} />
+                            {instrumentalBusy ? "Preparing instrumental…" : "Play with reduced vocals"}
+                            <span class="mi-hint">beta</span>
+                        </button>
+                        {#if instrumentalNote}
+                            <p class="mi-note">{instrumentalNote}</p>
+                        {/if}
+                        <div class="mi-rule"></div>
+                    {/if}
+                    {#if lyricsStore.autoSyncOff}
+                        <button
+                            class="mi"
+                            onclick={() => {
+                                menuOpen = false;
+                                setAutoSync(true);
+                            }}
+                        ><Icon name="refresh" size={14} /> Re-enable auto-sync</button>
+                    {/if}
+                    {#if lyricsStore.status === "synced"}
+                        <button
+                            class="mi"
+                            onclick={() => {
+                                menuOpen = false;
+                                openSyncEditor(lyricsStore.lines);
+                            }}
+                        ><Icon name="clock" size={14} /> Re-time by hand</button>
+                    {/if}
+                    <button
+                        class="mi"
+                        onclick={() => {
+                            menuOpen = false;
+                            searchCandidates();
+                        }}
+                    ><Icon name="search" size={14} /> Wrong lyrics? Search again</button>
+                    <button
+                        class="mi"
+                        onclick={() => {
+                            menuOpen = false;
+                            pasting = true;
+                        }}
+                    ><Icon name="file-text" size={14} /> Paste your own</button>
+                    <button
+                        class="mi"
+                        onclick={() => {
+                            menuOpen = false;
+                            resetLyrics();
+                        }}
+                    ><Icon name="refresh" size={14} /> Forget and look again</button>
+                </div>
+            {/if}
+        </span>
+    </span>
+{/snippet}
+
+<svelte:window onclick={menuOpen ? () => (menuOpen = false) : undefined} />
+
+<style>
+    .lyr {
+        display: flex;
+        flex-direction: column;
+        min-height: 0;
+    }
+
+    /* ── loading shimmer ── */
+    .shimmer {
+        display: flex;
+        flex-direction: column;
+        gap: 13px;
+        padding: 18px 4px;
+    }
+    .shimmer span {
+        height: 13px;
+        border-radius: 7px;
+        background: linear-gradient(
+            100deg,
+            var(--bg-highlight) 35%,
+            var(--bg-press) 50%,
+            var(--bg-highlight) 65%
+        );
+        background-size: 240% 100%;
+        animation: shimmer 1.4s ease-in-out infinite;
+    }
+    @keyframes shimmer {
+        from {
+            background-position: 120% 0;
+        }
+        to {
+            background-position: -120% 0;
+        }
+    }
+
+    /* ── toolbar ── */
+    .toolbar {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        padding: 2px 2px 8px;
+        min-height: 30px;
+    }
+    .src {
+        font-size: 10.5px;
+        font-weight: 700;
+        letter-spacing: 0.06em;
+        text-transform: uppercase;
+        color: var(--text-muted);
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        min-width: 0;
+        /* The label owns the slack: everything after it sits at the right. */
+        margin-right: auto;
+    }
+    .nudge {
+        display: inline-flex;
+        align-items: center;
+        gap: 2px;
+        background: var(--bg-highlight);
+        border-radius: 12px;
+        padding: 1px 4px;
+        flex: none;
+    }
+    .nudge .off {
+        min-width: 38px;
+        text-align: center;
+        font-size: 10px;
+        font-weight: 700;
+        color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+    }
+    .nudge .off.on {
+        color: var(--accent-hover);
+    }
+    .tools {
+        display: inline-flex;
+        align-items: center;
+        gap: 2px;
+        flex: none;
+    }
+    .tool {
+        display: grid;
+        place-items: center;
+        width: 24px;
+        height: 24px;
+        border-radius: 6px;
+        color: var(--text-muted);
+        font-size: 14px;
+        font-weight: 700;
+    }
+    .tool:hover {
+        background: var(--bg-press);
+        color: var(--text-primary);
+    }
+    .tool-menu {
+        position: relative;
+    }
+    .menu {
+        position: absolute;
+        top: calc(100% + 6px);
+        right: 0;
+        min-width: 220px;
+        background: var(--bg-elevated);
+        border: 1px solid var(--border);
+        border-radius: 10px;
+        padding: 5px;
+        z-index: 60;
+        box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55);
+    }
+    .mi {
+        display: flex;
+        align-items: center;
+        gap: 9px;
+        width: 100%;
+        padding: 8px 10px;
+        border-radius: 7px;
+        font-size: 12.5px;
+        font-weight: 600;
+        color: var(--text-secondary);
+        text-align: left;
+        white-space: nowrap;
+    }
+    .mi:hover {
+        background: var(--bg-highlight);
+        color: var(--text-primary);
+    }
+
+    /* ── synced lines ── */
+    .lines {
+        overflow-y: auto;
+        max-height: 46vh;
+        min-height: 180px;
+        scrollbar-width: none;
+        -webkit-mask-image: linear-gradient(
+            180deg,
+            transparent 0,
+            #000 28px,
+            #000 calc(100% - 34px),
+            transparent 100%
+        );
+        mask-image: linear-gradient(
+            180deg,
+            transparent 0,
+            #000 28px,
+            #000 calc(100% - 34px),
+            transparent 100%
+        );
+    }
+    .lines::-webkit-scrollbar {
+        width: 0;
+        display: none;
+    }
+    /* Just a breath above the first line — enough that the words clear the
+       toolbar's mask fade, not so much that a song opens on an empty box.
+       The tail is SEAT's complement (1 - 0.42), which is what lets the final
+       line scroll up to the same seat the rest of them ride at. */
+    .lead-space {
+        height: 7%;
+        flex: none;
+    }
+    .tail-space {
+        height: 58%;
+        flex: none;
+    }
+    .line {
+        display: block;
+        width: 100%;
+        text-align: left;
+        padding: 5px 6px;
+        border-radius: 7px;
+        font-size: 15px;
+        font-weight: 700;
+        line-height: 1.4;
+        color: var(--text-muted);
+        transition:
+            color 0.25s ease,
+            transform 0.25s ease,
+            opacity 0.25s ease;
+        transform-origin: left center;
+        white-space: pre-wrap;
+    }
+    .line:hover {
+        color: var(--text-secondary);
+        background: var(--bg-highlight);
+    }
+    .line.past {
+        color: var(--text-secondary);
+        opacity: 0.55;
+    }
+    .line.on {
+        color: var(--text-primary);
+        transform: scale(1.03);
+        opacity: 1;
+    }
+    .line.gap {
+        color: var(--text-muted);
+        opacity: 0.4;
+        font-size: 12px;
+        letter-spacing: 0.3em;
+    }
+    .line.gap.on {
+        color: var(--accent-hover);
+        opacity: 0.8;
+    }
+
+    /* ── karaoke rendering inside the active line ──
+       Word mode: crisp steps on the source's own word times. */
+    .wline {
+        display: block;
+    }
+    .w {
+        color: var(--text-secondary);
+        transition: color 0.12s ease;
+    }
+    .w + .w {
+        margin-left: 0.32em;
+    }
+    .w.sung {
+        color: #fff;
+    }
+
+    .autochip {
+        flex: none;
+        font-size: 10px;
+        font-weight: 800;
+        letter-spacing: 0.04em;
+        padding: 2.5px 8px;
+        border-radius: 9px;
+        background: var(--accent-soft);
+        color: var(--accent-hover);
+    }
+    .autochip:hover {
+        background: color-mix(in srgb, var(--accent) 26%, transparent);
+    }
+
+    .mi:disabled {
+        opacity: 0.6;
+    }
+    .mi .mi-hint {
+        margin-left: auto;
+        font-size: 9px;
+        font-weight: 800;
+        letter-spacing: 0.08em;
+        text-transform: uppercase;
+        color: var(--text-muted);
+        padding-left: 10px;
+    }
+    .mi-note {
+        font-size: 11px;
+        color: #e8a33d;
+        padding: 2px 10px 6px;
+        max-width: 240px;
+    }
+    .mi-rule {
+        height: 1px;
+        background: var(--border);
+        margin: 5px 8px;
+    }
+
+    /* Fullscreen scale — same skeleton, bigger voice. */
+    .lyr.big .lines {
+        max-height: none;
+        height: 100%;
+        min-height: 0;
+        flex: 1;
+    }
+    .lyr.big .line {
+        font-size: clamp(22px, 3.1vw, 38px);
+        font-weight: 800;
+        line-height: 1.35;
+        padding: 9px 12px;
+        border-radius: 12px;
+        letter-spacing: -0.01em;
+    }
+    .lyr.big .line.gap {
+        font-size: 16px;
+    }
+    .lyr.big .toolbar {
+        padding-bottom: 14px;
+    }
+
+    .syncnow {
+        display: inline-flex;
+        align-items: center;
+        gap: 7px;
+        align-self: flex-start;
+        margin: 0 2px 10px;
+        padding: 8px 15px;
+        border-radius: 16px;
+        background: var(--accent);
+        color: #000;
+        font-size: 12px;
+        font-weight: 800;
+    }
+    .syncnow:hover {
+        background: var(--accent-hover);
+    }
+
+    /* ── plain text ──
+       Everything about the box, the type and the fade comes from .lines and
+       .line above; only the differences live here. Nothing is seekable, so
+       the rows stay quiet under the pointer, and with no line ever lit there
+       is no muted/active contrast to carry — the whole sheet reads at the
+       secondary tone the synced list gives a line once it has been sung.
+       The tail mirrors the lead rather than reserving a seat (SEAT's
+       complement) that nothing will ever scroll up to. */
+    .lines.plain .line {
+        color: var(--text-secondary);
+        cursor: default;
+    }
+    .lines.plain .line:hover {
+        background: none;
+        color: var(--text-secondary);
+    }
+    .lines.plain .tail-space {
+        height: 7%;
+    }
+
+    /* ── states ── */
+    .statebox {
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+        text-align: center;
+        padding: 34px 12px 22px;
+        gap: 4px;
+    }
+    .state-glyph {
+        display: grid;
+        place-items: center;
+        width: 52px;
+        height: 52px;
+        border-radius: 16px;
+        background: var(--bg-highlight);
+        color: var(--text-muted);
+        margin-bottom: 8px;
+    }
+    .state-t {
+        font-size: 14.5px;
+        font-weight: 700;
+    }
+    .state-s {
+        font-size: 12px;
+        color: var(--text-muted);
+        max-width: 260px;
+    }
+    .state-actions {
+        display: flex;
+        gap: 8px;
+        margin-top: 12px;
+    }
+    .pbtn {
+        display: inline-flex;
+        align-items: center;
+        gap: 6px;
+        padding: 8px 15px;
+        border-radius: 16px;
+        background: var(--accent);
+        color: #000;
+        font-size: 12px;
+        font-weight: 700;
+        margin-top: 4px;
+    }
+    .pbtn:hover:not(:disabled) {
+        background: var(--accent-hover);
+    }
+    .pbtn:disabled {
+        opacity: 0.5;
+    }
+    .pbtn.ghost {
+        background: var(--bg-highlight);
+        color: var(--text-secondary);
+    }
+    .pbtn.ghost:hover {
+        background: var(--bg-press);
+        color: var(--text-primary);
+    }
+
+    /* ── candidate picker ── */
+    .pick-head {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        font-size: 12.5px;
+        font-weight: 700;
+        color: var(--text-secondary);
+        padding: 2px 2px 8px;
+    }
+    .note {
+        font-size: 12px;
+        color: var(--text-muted);
+        padding: 4px 2px 8px;
+    }
+    .mono {
+        font-family: Consolas, monospace;
+        font-size: 11px;
+        background: var(--bg-highlight);
+        border-radius: 4px;
+        padding: 1px 4px;
+        color: var(--text-primary);
+    }
+    .cands {
+        display: flex;
+        flex-direction: column;
+        gap: 1px;
+        max-height: 42vh;
+        overflow-y: auto;
+        scrollbar-width: none;
+    }
+    .cands::-webkit-scrollbar {
+        width: 0;
+        display: none;
+    }
+    .cand {
+        display: flex;
+        align-items: center;
+        gap: 9px;
+        padding: 8px 9px;
+        border-radius: 7px;
+        text-align: left;
+    }
+    .cand:hover {
+        background: var(--bg-highlight);
+    }
+    .c-main {
+        flex: 1;
+        min-width: 0;
+        display: flex;
+        flex-direction: column;
+    }
+    .c-t {
+        font-size: 13px;
+        font-weight: 600;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+    .c-a {
+        font-size: 11px;
+        color: var(--text-secondary);
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+    .c-tag {
+        flex: none;
+        font-size: 9.5px;
+        font-weight: 700;
+        text-transform: uppercase;
+        letter-spacing: 0.05em;
+        padding: 2px 6px;
+        border-radius: 7px;
+        background: var(--accent-soft);
+        color: var(--accent-hover);
+    }
+    .c-tag.inst {
+        background: var(--bg-highlight);
+        color: var(--text-muted);
+    }
+    .c-d {
+        flex: none;
+        font-size: 11px;
+        color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+    }
+
+    /* ── paste ── */
+    .paste textarea {
+        width: 100%;
+        min-height: 180px;
+        resize: vertical;
+        background: var(--bg-base);
+        color: var(--text-primary);
+        border: 1px solid var(--border);
+        border-radius: 8px;
+        padding: 10px;
+        font-family: Consolas, monospace;
+        font-size: 12px;
+        line-height: 1.6;
+        outline: none;
+    }
+    .paste textarea:focus {
+        border-color: var(--accent);
+    }
+    .paste-actions {
+        display: flex;
+        justify-content: flex-end;
+        gap: 8px;
+        margin-top: 8px;
+    }
+
+    @media (prefers-reduced-motion: reduce) {
+        .shimmer span {
+            animation: none;
+        }
+        .line {
+            transition: none;
+        }
+    }
+</style>

src/components/LyricsSyncEditor.svelte

@@ -0,0 +1,633 @@
+<script>
+    // The tap-to-sync editor — the research bundle's "minimal correction
+    // editor", first scope: play the song and press Space (or click) as each
+    // line begins; nudge or ripple-shift stamps afterwards; optionally
+    // pre-fill ESTIMATED times from the measured vocal-activity envelope.
+    // Saving writes the track's own user document, which outranks every
+    // automatic source in the waterfall.
+    import { untrack } from "svelte";
+    import { player } from "../lib/state.svelte.js";
+    import {
+        syncEditor,
+        closeSyncEditor,
+        saveSyncEditor,
+    } from "../lib/lyrics.svelte.js";
+    import { roughSync } from "../lib/lyric-sync.js";
+    import * as api from "../lib/api.js";
+    import Icon from "./Icon.svelte";
+    import { floatScroll } from "../lib/scrollbar.js";
+
+    let cursor = $state(0); // the next row a tap stamps
+    let ripple = $state(true); // ± adjustments shift later stamps too
+    let confirmDiscard = $state(false);
+    let saving = $state(false);
+    let saveError = $state("");
+    let activity = $state(null); // { frameMs, frames } | null
+    let activityFailed = $state(false);
+    let roughBusy = $state(false);
+    let listEl = $state(null);
+
+    // Position interpolation: ticks land ~5/s; a tap between ticks reads the
+    // last tick plus wall-clock elapsed, so stamps carry tap precision.
+    let lastPos = 0;
+    let lastPosAt = 0;
+    $effect(() => {
+        lastPos = player.position ?? 0;
+        lastPosAt = performance.now();
+    });
+    function nowMs() {
+        const base = (player.status === "playing"
+            ? lastPos + (performance.now() - lastPosAt) / 1000
+            : (player.position ?? 0));
+        return Math.max(0, Math.round(base * 1000));
+    }
+
+    // Reset per open; pull the activity envelope for the strip + rough fill.
+    // Keyed on the open FLIP alone — the untrack boundary is load-bearing
+    // twice over. Without it this effect (a) read `cursor` back after writing
+    // it, so the all-stamped re-time path ping-ponged -1 ↔ rows.length until
+    // Svelte hit effect_update_depth_exceeded and tore the subtree down,
+    // leaving a painted room no click could close; and (b) depended on every
+    // row's time_ms through findIndex, so each tap re-ran the whole reset —
+    // wiping the discard guard and re-running the DSP decode per stamp.
+    $effect(() => {
+        if (!syncEditor.open) return;
+        untrack(() => {
+            const firstUnstamped = syncEditor.rows.findIndex((r) => r.time_ms == null);
+            cursor = firstUnstamped < 0 ? syncEditor.rows.length : firstUnstamped;
+            confirmDiscard = false;
+            activity = null;
+            activityFailed = false;
+            const path = syncEditor.itemPath;
+            if (path) {
+                api.lyricsVocalActivity(path)
+                    .then((a) => (activity = a))
+                    .catch(() => (activityFailed = true));
+            } else {
+                activityFailed = true;
+            }
+        });
+    });
+
+    const stampedCount = $derived(syncEditor.rows.filter((r) => r.time_ms != null).length);
+    const allStamped = $derived(
+        syncEditor.rows.length > 0 && stampedCount === syncEditor.rows.length,
+    );
+
+    function stampCursor() {
+        if (cursor >= syncEditor.rows.length) return;
+        syncEditor.rows[cursor].time_ms = nowMs();
+        syncEditor.estimated = false;
+        cursor += 1;
+        scrollCursorIntoView();
+    }
+    function stampRow(index) {
+        syncEditor.rows[index].time_ms = nowMs();
+        syncEditor.estimated = false;
+        cursor = Math.max(cursor, index + 1);
+    }
+    function unstampLast() {
+        const last = cursor - 1;
+        if (last < 0) return;
+        syncEditor.rows[last].time_ms = null;
+        cursor = last;
+        scrollCursorIntoView();
+    }
+    function adjustRow(index, deltaMs) {
+        const row = syncEditor.rows[index];
+        if (row.time_ms == null) return;
+        row.time_ms = Math.max(0, row.time_ms + deltaMs);
+        if (ripple) {
+            for (let i = index + 1; i < syncEditor.rows.length; i++) {
+                if (syncEditor.rows[i].time_ms != null) {
+                    syncEditor.rows[i].time_ms = Math.max(0, syncEditor.rows[i].time_ms + deltaMs);
+                }
+            }
+        }
+    }
+    function scrollCursorIntoView() {
+        requestAnimationFrame(() => {
+            listEl
+                ?.querySelector(`[data-row="${Math.min(cursor, syncEditor.rows.length - 1)}"]`)
+                ?.scrollIntoView({ block: "center", behavior: "smooth" });
+        });
+    }
+
+    function roughFill() {
+        if (!activity || roughBusy) return;
+        roughBusy = true;
+        try {
+            const filled = roughSync(
+                syncEditor.rows.map((r) => r.text).join("\n"),
+                activity.frames,
+                activity.frameMs,
+            );
+            if (filled && filled.length === syncEditor.rows.length) {
+                for (let i = 0; i < filled.length; i++) {
+                    syncEditor.rows[i].time_ms = filled[i].time_ms;
+                }
+                syncEditor.estimated = true;
+                cursor = 0; // re-tap from the top to correct
+            } else {
+                activityFailed = true; // not enough vocal evidence — refused
+            }
+        } finally {
+            roughBusy = false;
+        }
+    }
+
+    async function restartSong() {
+        await api.playerControl("seek", 0).catch(() => {});
+        if (player.status !== "playing") await api.playerControl("resume").catch(() => {});
+    }
+    function back5() {
+        api.playerControl("seek", Math.max(0, (player.position ?? 0) - 5)).catch(() => {});
+    }
+    function togglePlay() {
+        api.playerControl(player.status === "playing" ? "pause" : "resume").catch(() => {});
+    }
+
+    async function save() {
+        if (!allStamped || saving) return;
+        saving = true;
+        saveError = "";
+        try {
+            const ok = await saveSyncEditor();
+            if (!ok) {
+                saveError =
+                    "Saving failed — if the app was just updated, restart it once so the sync backend is loaded.";
+            }
+        } finally {
+            saving = false;
+        }
+    }
+    function requestClose() {
+        if (stampedCount > 0 && !confirmDiscard) {
+            confirmDiscard = true;
+            return;
+        }
+        closeSyncEditor();
+    }
+
+    function onkeydown(e) {
+        if (e.key === " ") {
+            e.preventDefault();
+            e.stopPropagation();
+            stampCursor();
+        } else if (e.key === "Backspace") {
+            e.preventDefault();
+            unstampLast();
+        } else if (e.key === "Escape") {
+            requestClose();
+        }
+    }
+
+    // Playing another track mid-edit: stamps would land on the wrong clock.
+    const wrongTrack = $derived.by(() => {
+        if (!syncEditor.open) return false;
+        const item = player.queue?.[player.queueIndex] ?? null;
+        const title = player.track?.title ?? "";
+        return title !== (syncEditor.identity?.title ?? "") && !(item?.path === syncEditor.itemPath);
+    });
+
+    const playheadPct = $derived.by(() => {
+        const duration = player.duration ?? syncEditor.identity?.durationSecs ?? 0;
+        if (!duration) return 0;
+        return Math.min(100, ((player.position ?? 0) / duration) * 100);
+    });
+
+    // The activity strip, downsampled to ~180 columns of inline SVG.
+    const strip = $derived.by(() => {
+        if (!activity?.frames?.length) return [];
+        const columns = 180;
+        const per = Math.max(1, Math.floor(activity.frames.length / columns));
+        const out = [];
+        for (let i = 0; i < activity.frames.length; i += per) {
+            let max = 0;
+            for (let j = i; j < Math.min(i + per, activity.frames.length); j++) {
+                max = Math.max(max, activity.frames[j]);
+            }
+            out.push(max);
+        }
+        return out;
+    });
+    const totalMs = $derived.by(() => {
+        const duration = player.duration ?? syncEditor.identity?.durationSecs ?? 0;
+        return duration * 1000 || (activity ? activity.frames.length * activity.frameMs : 0);
+    });
+
+    function fmt(ms) {
+        if (ms == null) return "–:––";
+        const total = Math.floor(ms / 1000);
+        return `${Math.floor(total / 60)}:${String(total % 60).padStart(2, "0")}`;
+    }
+</script>
+
+<svelte:window onkeydown={syncEditor.open ? onkeydown : undefined} />
+
+{#if syncEditor.open}
+    <div class="room">
+        <header>
+            <div class="who">
+                <p class="eyebrow">Sync lyrics {syncEditor.estimated ? "· estimated — tap to correct" : ""}</p>
+                <p class="t">{syncEditor.identity?.title ?? ""}</p>
+                <p class="a">{syncEditor.identity?.artist ?? ""}</p>
+            </div>
+            <div class="head-actions">
+                <span class="count">{stampedCount} / {syncEditor.rows.length} stamped</span>
+                <button class="btn" onclick={save} disabled={!allStamped || saving}>
+                    {saving ? "Saving…" : "Save timing"}
+                </button>
+                <button class="close" title={confirmDiscard ? "Discard timing?" : "Close (Esc)"} onclick={requestClose}>
+                    {#if confirmDiscard}<span class="discard">Discard?</span>{:else}<Icon name="x" size={17} />{/if}
+                </button>
+            </div>
+        </header>
+
+        {#if saveError}
+            <div class="warnbar">
+                <Icon name="alert" size={13} />
+                {saveError}
+            </div>
+        {/if}
+        {#if wrongTrack}
+            <div class="warnbar">
+                <Icon name="alert" size={13} />
+                Playback moved to another track — stamps follow the PLAYING clock. Play
+                “{syncEditor.identity?.title}” again to keep tapping.
+            </div>
+        {/if}
+
+        <div class="stripwrap" aria-hidden="true">
+            {#if strip.length}
+                <svg class="strip" preserveAspectRatio="none" viewBox="0 0 {strip.length} 40">
+                    {#each strip as v, i (i)}
+                        <rect x={i} y={40 - v * 38} width="0.85" height={v * 38} rx="0.3" />
+                    {/each}
+                    {#each syncEditor.rows as row (row)}
+                        {#if row.time_ms != null && totalMs}
+                            <rect
+                                class="mark"
+                                x={(row.time_ms / totalMs) * strip.length}
+                                y="0"
+                                width="0.28"
+                                height="40"
+                            />
+                        {/if}
+                    {/each}
+                </svg>
+                <span class="playhead" style="left: {playheadPct}%"></span>
+            {:else if activityFailed}
+                <p class="strip-note">
+                    {syncEditor.itemPath
+                        ? "No usable vocal-band evidence for the estimate — tap by hand."
+                        : "Streamed track — the activity strip and estimate need a local file."}
+                </p>
+            {:else}
+                <p class="strip-note">Reading the vocal band…</p>
+            {/if}
+        </div>
+
+        <div class="controls">
+            <button class="tbtn" title="Restart the song" onclick={restartSong}>
+                <Icon name="skip-back" size={14} />
+            </button>
+            <button class="tbtn" title="Back 5 seconds" onclick={back5}>−5s</button>
+            <button class="tbtn main" title="Play / pause" onclick={togglePlay}>
+                <Icon name={player.status === "playing" ? "pause" : "play"} size={16} />
+            </button>
+            <span class="clock">{fmt((player.position ?? 0) * 1000)}</span>
+            <span class="spacer"></span>
+            <button
+                class="tbtn wide"
+                title="Estimate rough times from the vocal band, then correct by tapping"
+                onclick={roughFill}
+                disabled={!activity || roughBusy}
+            >
+                Rough-fill (estimated)
+            </button>
+            <label class="ripple">
+                <input type="checkbox" bind:checked={ripple} />
+                ripple ± to later lines
+            </label>
+        </div>
+
+        <p class="hint">
+            Press <span class="key">Space</span> (or click the line) as each line begins ·
+            <span class="key">Backspace</span> re-arms the previous line
+        </p>
+
+        <div class="rows" bind:this={listEl} use:floatScroll>
+            {#each syncEditor.rows as row, index (index)}
+                <div
+                    class="row"
+                    class:next={index === cursor}
+                    class:stamped={row.time_ms != null}
+                    data-row={index}
+                >
+                    <button
+                        class="stamp"
+                        title={row.time_ms != null ? "Re-stamp at the playhead" : "Stamp at the playhead"}
+                        onclick={() => stampRow(index)}
+                    >
+                        {fmt(row.time_ms)}
+                    </button>
+                    <span class="text">{row.text}</span>
+                    {#if row.time_ms != null}
+                        <span class="adj">
+                            <button class="abtn" title="Earlier (−0.25s)" onclick={() => adjustRow(index, -250)}>−</button>
+                            <button class="abtn" title="Later (+0.25s)" onclick={() => adjustRow(index, 250)}>+</button>
+                        </span>
+                    {/if}
+                </div>
+            {/each}
+        </div>
+    </div>
+{/if}
+
+<style>
+    .room {
+        position: fixed;
+        inset: 0;
+        z-index: 95;
+        display: flex;
+        flex-direction: column;
+        background:
+            radial-gradient(120% 80% at 15% 0%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 55%),
+            var(--bg-base);
+        padding: 22px 34px 18px;
+    }
+    header {
+        display: flex;
+        align-items: flex-start;
+        justify-content: space-between;
+        gap: 18px;
+        flex: none;
+    }
+    .eyebrow {
+        font-size: 10.5px;
+        font-weight: 800;
+        letter-spacing: 0.09em;
+        text-transform: uppercase;
+        color: var(--accent-hover);
+    }
+    .t {
+        font-size: 20px;
+        font-weight: 800;
+        margin-top: 2px;
+    }
+    .a {
+        font-size: 13px;
+        color: var(--text-secondary);
+        margin-top: 1px;
+    }
+    .head-actions {
+        display: flex;
+        align-items: center;
+        gap: 12px;
+        flex: none;
+    }
+    .count {
+        font-size: 12px;
+        font-weight: 700;
+        color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+    }
+    .btn {
+        padding: 9px 18px;
+        border-radius: 18px;
+        background: var(--accent);
+        color: #000;
+        font-size: 13px;
+        font-weight: 800;
+    }
+    .btn:hover:not(:disabled) {
+        background: var(--accent-hover);
+    }
+    .btn:disabled {
+        opacity: 0.45;
+    }
+    .close {
+        display: grid;
+        place-items: center;
+        min-width: 36px;
+        height: 36px;
+        border-radius: 18px;
+        color: var(--text-secondary);
+        background: rgba(255, 255, 255, 0.06);
+        padding: 0 10px;
+    }
+    .close:hover {
+        color: var(--text-primary);
+        background: rgba(255, 255, 255, 0.12);
+    }
+    .discard {
+        font-size: 12px;
+        font-weight: 800;
+        color: #f15e6c;
+    }
+
+    .warnbar {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        margin-top: 12px;
+        padding: 8px 13px;
+        border-radius: 9px;
+        background: rgba(232, 163, 61, 0.13);
+        color: #e8a33d;
+        font-size: 12.5px;
+        font-weight: 700;
+        flex: none;
+    }
+
+    .stripwrap {
+        position: relative;
+        height: 52px;
+        margin-top: 14px;
+        border-radius: 8px;
+        background: var(--bg-elevated);
+        overflow: hidden;
+        flex: none;
+    }
+    .strip {
+        position: absolute;
+        inset: 4px 6px;
+        width: calc(100% - 12px);
+        height: calc(100% - 8px);
+    }
+    .strip rect {
+        fill: color-mix(in srgb, var(--accent) 55%, transparent);
+    }
+    .strip rect.mark {
+        fill: #fff;
+        opacity: 0.85;
+    }
+    .playhead {
+        position: absolute;
+        top: 0;
+        bottom: 0;
+        width: 1.5px;
+        background: #fff;
+        opacity: 0.9;
+    }
+    .strip-note {
+        position: absolute;
+        inset: 0;
+        display: grid;
+        place-items: center;
+        font-size: 12px;
+        color: var(--text-muted);
+    }
+
+    .controls {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        margin-top: 12px;
+        flex: none;
+    }
+    .tbtn {
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+        gap: 6px;
+        min-width: 38px;
+        height: 34px;
+        padding: 0 12px;
+        border-radius: 17px;
+        background: var(--bg-highlight);
+        color: var(--text-secondary);
+        font-size: 12.5px;
+        font-weight: 700;
+    }
+    .tbtn:hover:not(:disabled) {
+        background: var(--bg-press);
+        color: var(--text-primary);
+    }
+    .tbtn:disabled {
+        opacity: 0.45;
+    }
+    .tbtn.main {
+        background: var(--accent);
+        color: #000;
+    }
+    .tbtn.main:hover {
+        background: var(--accent-hover);
+    }
+    .clock {
+        font-size: 12.5px;
+        font-weight: 700;
+        color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+        min-width: 44px;
+    }
+    .spacer {
+        flex: 1;
+    }
+    .ripple {
+        display: flex;
+        align-items: center;
+        gap: 6px;
+        font-size: 12px;
+        color: var(--text-secondary);
+        cursor: pointer;
+    }
+    .ripple input {
+        accent-color: var(--accent);
+    }
+
+    .hint {
+        margin-top: 10px;
+        font-size: 12px;
+        color: var(--text-muted);
+        flex: none;
+    }
+    .key {
+        display: inline-block;
+        padding: 1px 7px;
+        border-radius: 5px;
+        background: var(--bg-highlight);
+        border: 1px solid var(--border);
+        font-size: 11px;
+        font-weight: 700;
+        color: var(--text-secondary);
+    }
+
+    .rows {
+        flex: 1;
+        min-height: 0;
+        overflow-y: auto;
+        margin-top: 10px;
+        padding-right: 8px;
+    }
+    .row {
+        display: flex;
+        align-items: center;
+        gap: 14px;
+        padding: 7px 10px;
+        border-radius: 8px;
+        transition: background 0.15s;
+    }
+    .row.next {
+        background: var(--accent-soft);
+    }
+    .row.next .text {
+        color: var(--text-primary);
+        font-weight: 800;
+    }
+    .stamp {
+        flex: none;
+        width: 64px;
+        text-align: center;
+        padding: 4px 0;
+        border-radius: 7px;
+        background: var(--bg-highlight);
+        color: var(--text-muted);
+        font-size: 12px;
+        font-weight: 700;
+        font-variant-numeric: tabular-nums;
+    }
+    .row.stamped .stamp {
+        background: var(--accent-soft);
+        color: var(--accent-hover);
+    }
+    .stamp:hover {
+        background: var(--bg-press);
+        color: var(--text-primary);
+    }
+    .text {
+        flex: 1;
+        min-width: 0;
+        font-size: 15.5px;
+        font-weight: 600;
+        color: var(--text-secondary);
+        line-height: 1.45;
+    }
+    .row.stamped .text {
+        color: var(--text-primary);
+    }
+    .adj {
+        display: none;
+        gap: 4px;
+        flex: none;
+    }
+    .row:hover .adj {
+        display: inline-flex;
+    }
+    .abtn {
+        display: grid;
+        place-items: center;
+        width: 26px;
+        height: 26px;
+        border-radius: 7px;
+        background: var(--bg-highlight);
+        color: var(--text-secondary);
+        font-size: 14px;
+        font-weight: 800;
+    }
+    .abtn:hover {
+        background: var(--bg-press);
+        color: var(--text-primary);
+    }
+</style>

src/components/NowPlaying.svelte

@@ -28,6 +28,8 @@
     } from "../lib/state.svelte.js";
     import Icon from "./Icon.svelte";
     import SaveMenu from "./SaveMenu.svelte";
+    import LyricsPane from "./LyricsPane.svelte";
+    import PlaylistMenu from "./PlaylistMenu.svelte";
     import * as api from "../lib/api.js";
     import { floatScroll } from "../lib/scrollbar.js";
     import { splitDescription } from "../lib/editions.js";
@@ -1087,6 +1089,27 @@
                     {metaParts[1] || player.track?.title || "Nothing playing"}
                 </span>
             </div>
+            {#if currentItem}
+                <PlaylistMenu
+                    compact
+                    align="right"
+                    iconSize={15}
+                    title="Add this track to a playlist"
+                    tracks={() => [
+                        {
+                            title: currentItem.title,
+                            artist: currentItem.artist ?? metaParts[0] ?? null,
+                            album: currentItem.album ?? metaParts[1] ?? null,
+                            duration_secs: currentItem.duration ?? null,
+                            // A stream item's path names a file on the PEER's
+                            // machine — the row goes in as a placeholder that
+                            // streams on click, not as a fake local file.
+                            path: currentItem.stream ? null : currentItem.path,
+                            art_path: currentItem.stream ? null : (currentItem.art ?? null),
+                        },
+                    ]}
+                />
+            {/if}
             <!-- Saving what you are streaming lived in the popover. It is the
                  only ACTION that did, so it comes up here rather than being
                  lost with it. -->
@@ -1272,9 +1295,7 @@
                         {/if}
 
                     {:else if pane === "lyrics"}
-                        <p class="pane-empty">
-                            Lyrics aren't wired up yet — this pane is a placeholder.
-                        </p>
+                        <LyricsPane />
 
                     {:else if pane === "artist"}
                         {@render artistChip()}
@@ -1825,6 +1846,17 @@
         color: var(--text-secondary);
     }
     .np-icon:hover { background: var(--bg-highlight); color: var(--text-primary); }
+    /* The add-to-playlist trigger wears the header-icon look exactly. */
+    .np-head :global(.plm-trigger) {
+        width: 28px;
+        height: 28px;
+        border-radius: 6px;
+        color: var(--text-secondary);
+    }
+    .np-head :global(.plm-trigger:hover) {
+        background: var(--bg-highlight);
+        color: var(--text-primary);
+    }
 
     .np-scroll {
         /* Fills the absolutely-positioned .full-view rather than sizing to its

src/components/PlaylistImportModal.svelte

@@ -0,0 +1,554 @@
+<script>
+    // Staged playlist import: parse → resolve → REVIEW → one-transaction
+    // commit. The preview names what matched and what did not; unresolved
+    // rows stay visible placeholders unless the user explicitly leaves them
+    // out. Nothing touches the database until "Create playlist".
+    import * as api from "../lib/api.js";
+    import Icon from "./Icon.svelte";
+
+    let {
+        open = $bindable(false),
+        mode = "file", // "file": a probed draft arrives via `draft`; "paste": textarea first
+        draft = null,
+        onimported = () => {},
+    } = $props();
+
+    let pasteText = $state("");
+    let localDraft = $state(null);
+    let name = $state("");
+    let includeUnresolved = $state(true);
+    let committing = $state(false);
+    let parsing = $state(false);
+    let error = $state("");
+
+    // The working draft: probed (file mode) or built from the paste box.
+    const working = $derived(localDraft ?? draft);
+
+    // Re-arm the form whenever the modal opens with a new draft.
+    $effect(() => {
+        if (!open) return;
+        error = "";
+        committing = false;
+        localDraft = null;
+        pasteText = "";
+        includeUnresolved = true;
+        name = draft?.name ?? "";
+    });
+    async function previewPaste() {
+        if (!pasteText.trim() || parsing) return;
+        parsing = true;
+        error = "";
+        try {
+            const parsed = await api.playlistImportText(pasteText);
+            if (!parsed.entries.length) {
+                error = "No tracks recognized in that text.";
+            } else {
+                localDraft = parsed;
+                if (!name) name = parsed.name ?? "";
+            }
+        } catch (e) {
+            error = String(e);
+        } finally {
+            parsing = false;
+        }
+    }
+
+    const kept = $derived.by(() => {
+        if (!working) return [];
+        return includeUnresolved
+            ? working.entries
+            : working.entries.filter((e) => e.resolution === "local");
+    });
+
+    async function commit() {
+        if (!working || committing) return;
+        const finalName = (name || working.name || "Imported playlist").trim();
+        committing = true;
+        error = "";
+        try {
+            const id = await api.playlistImportCommit(
+                finalName,
+                working.description ?? null,
+                working.kind,
+                kept,
+            );
+            onimported(id, finalName);
+        } catch (e) {
+            error = String(e);
+            committing = false;
+        }
+    }
+
+    function close() {
+        open = false;
+    }
+
+    function fmtTime(ms) {
+        if (ms == null) return "";
+        const total = Math.floor(ms / 1000);
+        const h = Math.floor(total / 3600);
+        const m = Math.floor((total % 3600) / 60);
+        const s = total % 60;
+        return h > 0
+            ? `${h}:${String(m).padStart(2, "0")}:${String(s).padStart(2, "0")}`
+            : `${m}:${String(s).padStart(2, "0")}`;
+    }
+
+    function fmtDur(secs) {
+        if (!secs) return "";
+        return `${Math.floor(secs / 60)}:${String(secs % 60).padStart(2, "0")}`;
+    }
+
+    function onkeydown(e) {
+        if (e.key === "Escape") close();
+    }
+
+    const FORMAT_LABEL = {
+        m3u: "M3U",
+        pls: "PLS",
+        xspf: "XSPF",
+        csv: "CSV",
+        soulstream: "SoulStream backup",
+        text: "Pasted text",
+        folder: "Folder",
+    };
+</script>
+
+<svelte:window onkeydown={open ? onkeydown : undefined} />
+
+{#if open}
+    <!-- svelte-ignore a11y_click_events_have_key_events, a11y_no_static_element_interactions -->
+    <div class="scrim" onclick={close} role="presentation">
+        <!-- svelte-ignore a11y_click_events_have_key_events, a11y_no_noninteractive_element_interactions -->
+        <div
+            class="dialog"
+            role="dialog"
+            aria-modal="true"
+            aria-label="Import playlist"
+            tabindex="-1"
+            onclick={(e) => e.stopPropagation()}
+        >
+            <header>
+                <h2>
+                    {#if working}
+                        Review import
+                    {:else}
+                        Paste a tracklist
+                    {/if}
+                </h2>
+                <button class="x" title="Close" onclick={close}>
+                    <Icon name="x" size={16} />
+                </button>
+            </header>
+
+            {#if !working}
+                <p class="lead">
+                    One track per line. Timestamps make it a setlist —
+                    <span class="mono">00:00 Artist - Title</span> keeps its place in the mix.
+                </p>
+                <textarea
+                    bind:value={pasteText}
+                    placeholder={"00:00 Bicep - Glue\n05:30 Overmono - So U Kno\nFour Tet - Baby"}
+                    spellcheck="false"
+                ></textarea>
+                {#if error}<p class="error">{error}</p>{/if}
+                <footer>
+                    <button class="btn ghost" onclick={close}>Cancel</button>
+                    <button
+                        class="btn primary"
+                        onclick={previewPaste}
+                        disabled={!pasteText.trim() || parsing}
+                    >
+                        {parsing ? "Reading…" : "Preview"}
+                    </button>
+                </footer>
+            {:else}
+                <div class="srcline">
+                    <span class="chip">{FORMAT_LABEL[working.format] ?? working.format}</span>
+                    {#if working.kind === "setlist"}<span class="chip set">Setlist</span>{/if}
+                    <span class="srcname" title={working.source_name}>{working.source_name}</span>
+                    <span class="counts">
+                        <b class="ok">{working.resolved_count}</b> matched
+                        {#if working.unresolved_count > 0}
+                            &thinsp;·&thinsp;<b class="un">{working.unresolved_count}</b> unresolved
+                        {/if}
+                    </span>
+                </div>
+
+                {#if working.warnings?.length}
+                    <div class="warnings">
+                        {#each working.warnings as w, wi (wi)}
+                            <p><Icon name="alert" size={12} /> {w}</p>
+                        {/each}
+                    </div>
+                {/if}
+
+                <div class="rows" tabindex="-1">
+                    {#each working.entries as e (e.ordinal)}
+                        <div
+                            class="row"
+                            class:unresolved={e.resolution !== "local"}
+                            class:excluded={!includeUnresolved && e.resolution !== "local"}
+                        >
+                            <span class="n">{e.ordinal + 1}</span>
+                            {#if working.kind === "setlist"}
+                                <span class="t">{fmtTime(e.start_ms)}</span>
+                            {/if}
+                            <span class="who" title={e.raw}>
+                                <span class="ti">{e.title}</span>
+                                {#if e.artist}<span class="ar">{e.artist}</span>{/if}
+                            </span>
+                            <span class="ev">
+                                {#if e.resolution === "local"}
+                                    <span
+                                        class="tag ok"
+                                        title={e.matched_by === "path"
+                                            ? "Matched by exact file path"
+                                            : e.matched_by === "relinked"
+                                              ? "File found under the current library folder"
+                                              : "Matched by artist and title tags"}
+                                    >
+                                        <Icon name="check" size={11} />
+                                        {e.matched_by === "path" || e.matched_by === "file"
+                                            ? "file"
+                                            : e.matched_by === "relinked"
+                                              ? "relinked"
+                                              : "tags"}
+                                    </span>
+                                {:else}
+                                    <span class="tag un" title="No local match — kept as a placeholder">
+                                        unresolved
+                                    </span>
+                                {/if}
+                            </span>
+                            <span class="du">{fmtDur(e.duration_secs)}</span>
+                        </div>
+                    {/each}
+                </div>
+
+                <div class="form">
+                    <input
+                        class="name"
+                        bind:value={name}
+                        placeholder="Playlist name"
+                        spellcheck="false"
+                    />
+                    {#if working.unresolved_count > 0}
+                        <label class="keep">
+                            <input type="checkbox" bind:checked={includeUnresolved} />
+                            Keep unresolved entries as placeholders
+                        </label>
+                    {/if}
+                </div>
+                {#if error}<p class="error">{error}</p>{/if}
+                <footer>
+                    {#if mode === "paste"}
+                        <button class="btn ghost" onclick={() => (localDraft = null)}>Back</button>
+                    {:else}
+                        <button class="btn ghost" onclick={close}>Cancel</button>
+                    {/if}
+                    <button
+                        class="btn primary"
+                        onclick={commit}
+                        disabled={committing || kept.length === 0}
+                    >
+                        {committing
+                            ? "Creating…"
+                            : `Create playlist (${kept.length} ${kept.length === 1 ? "track" : "tracks"})`}
+                    </button>
+                </footer>
+            {/if}
+        </div>
+    </div>
+{/if}
+
+<style>
+    .scrim {
+        position: fixed;
+        inset: 0;
+        z-index: 120;
+        background: rgba(0, 0, 0, 0.6);
+        display: grid;
+        place-items: center;
+        backdrop-filter: blur(3px);
+    }
+    .dialog {
+        width: min(640px, calc(100vw - 64px));
+        max-height: min(78vh, 760px);
+        display: flex;
+        flex-direction: column;
+        background: var(--bg-elevated);
+        border: 1px solid var(--border);
+        border-radius: 14px;
+        padding: 20px 22px 18px;
+        box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
+    }
+    header {
+        display: flex;
+        align-items: center;
+        justify-content: space-between;
+        margin-bottom: 12px;
+    }
+    h2 {
+        font-size: 18px;
+        font-weight: 700;
+    }
+    .x {
+        display: grid;
+        place-items: center;
+        width: 28px;
+        height: 28px;
+        border-radius: 6px;
+        color: var(--text-secondary);
+    }
+    .x:hover {
+        background: var(--bg-highlight);
+        color: var(--text-primary);
+    }
+
+    .lead {
+        font-size: 13px;
+        color: var(--text-secondary);
+        margin-bottom: 10px;
+    }
+    .mono {
+        font-family: Consolas, monospace;
+        font-size: 12px;
+        color: var(--text-primary);
+        background: var(--bg-highlight);
+        border-radius: 4px;
+        padding: 1px 5px;
+    }
+    textarea {
+        width: 100%;
+        min-height: 220px;
+        resize: vertical;
+        background: var(--bg-base);
+        color: var(--text-primary);
+        border: 1px solid var(--border);
+        border-radius: 8px;
+        padding: 12px;
+        font-family: Consolas, monospace;
+        font-size: 12.5px;
+        line-height: 1.6;
+        outline: none;
+    }
+    textarea:focus {
+        border-color: var(--accent);
+    }
+
+    .srcline {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        margin-bottom: 10px;
+        min-width: 0;
+    }
+    .chip {
+        font-size: 10px;
+        font-weight: 700;
+        letter-spacing: 0.05em;
+        text-transform: uppercase;
+        background: var(--bg-highlight);
+        color: var(--text-secondary);
+        padding: 3px 8px;
+        border-radius: 8px;
+        flex: none;
+    }
+    .chip.set {
+        background: var(--accent-soft);
+        color: var(--accent-hover);
+    }
+    .srcname {
+        font-size: 12.5px;
+        color: var(--text-muted);
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        min-width: 0;
+    }
+    .counts {
+        margin-left: auto;
+        flex: none;
+        font-size: 12px;
+        color: var(--text-muted);
+    }
+    .counts .ok {
+        color: #3ecf7e;
+    }
+    .counts .un {
+        color: #e8a33d;
+    }
+
+    .warnings {
+        margin-bottom: 8px;
+    }
+    .warnings p {
+        display: flex;
+        align-items: center;
+        gap: 6px;
+        font-size: 11.5px;
+        color: #e8a33d;
+    }
+
+    .rows {
+        flex: 1;
+        min-height: 120px;
+        overflow-y: auto;
+        border: 1px solid var(--border);
+        border-radius: 8px;
+        background: var(--bg-base);
+        padding: 4px;
+    }
+    .row {
+        display: flex;
+        align-items: center;
+        gap: 10px;
+        padding: 6px 8px;
+        border-radius: 5px;
+        font-size: 12.5px;
+    }
+    .row:hover {
+        background: var(--bg-highlight);
+    }
+    .row.excluded {
+        opacity: 0.35;
+        text-decoration: line-through;
+    }
+    .n {
+        width: 26px;
+        flex: none;
+        text-align: right;
+        color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+        font-size: 11px;
+    }
+    .t {
+        width: 52px;
+        flex: none;
+        color: var(--accent-hover);
+        font-variant-numeric: tabular-nums;
+        font-size: 11.5px;
+    }
+    .who {
+        flex: 1;
+        min-width: 0;
+        display: flex;
+        flex-direction: column;
+    }
+    .ti {
+        font-weight: 600;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+    .ar {
+        font-size: 11px;
+        color: var(--text-secondary);
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+    .ev {
+        flex: none;
+    }
+    .tag {
+        display: inline-flex;
+        align-items: center;
+        gap: 4px;
+        font-size: 10px;
+        font-weight: 700;
+        padding: 2.5px 7px;
+        border-radius: 8px;
+    }
+    .tag.ok {
+        background: rgba(62, 207, 126, 0.13);
+        color: #3ecf7e;
+    }
+    .tag.un {
+        background: rgba(232, 163, 61, 0.15);
+        color: #e8a33d;
+    }
+    .du {
+        width: 40px;
+        flex: none;
+        text-align: right;
+        color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+        font-size: 11.5px;
+    }
+
+    .form {
+        display: flex;
+        align-items: center;
+        gap: 14px;
+        margin-top: 12px;
+    }
+    .name {
+        flex: 1;
+        background: var(--bg-base);
+        color: var(--text-primary);
+        border: 1px solid var(--border);
+        border-radius: 8px;
+        padding: 9px 12px;
+        font-size: 13.5px;
+        font-weight: 600;
+        outline: none;
+    }
+    .name:focus {
+        border-color: var(--accent);
+    }
+    .keep {
+        display: flex;
+        align-items: center;
+        gap: 7px;
+        font-size: 12px;
+        color: var(--text-secondary);
+        cursor: pointer;
+        flex: none;
+    }
+    .keep input {
+        accent-color: var(--accent);
+    }
+
+    .error {
+        margin-top: 8px;
+        font-size: 12.5px;
+        color: #f15e6c;
+    }
+
+    footer {
+        display: flex;
+        justify-content: flex-end;
+        gap: 10px;
+        margin-top: 14px;
+    }
+    .btn {
+        display: inline-flex;
+        align-items: center;
+        gap: 7px;
+        padding: 9px 18px;
+        border-radius: 20px;
+        font-size: 13px;
+        font-weight: 700;
+        transition: background 0.14s;
+    }
+    .btn.primary {
+        background: var(--accent);
+        color: #000;
+    }
+    .btn.primary:hover:not(:disabled) {
+        background: var(--accent-hover);
+    }
+    .btn.primary:disabled {
+        opacity: 0.5;
+    }
+    .btn.ghost {
+        background: var(--bg-highlight);
+        color: var(--text-secondary);
+    }
+    .btn.ghost:hover {
+        background: var(--bg-press);
+        color: var(--text-primary);
+    }
+</style>

src/components/PlaylistMenu.svelte

@@ -0,0 +1,211 @@
+<script>
+    // "Add to playlist" dropdown — one component for every surface (album
+    // rail, track rows, Now Playing). Callers hand a THUNK that produces the
+    // rows when a target is picked, so building the payload costs nothing
+    // until the user actually commits.
+    import { playlistStore, refreshPlaylists } from "../lib/state.svelte.js";
+    import * as api from "../lib/api.js";
+    import Icon from "./Icon.svelte";
+
+    let {
+        // () => [{ title, artist, album, durationSecs, path, artPath }]
+        tracks,
+        align = "left", // "left" | "right"
+        iconSize = 13,
+        title = "Add to playlist",
+        compact = false, // icon-only trigger
+    } = $props();
+
+    let open = $state(false);
+    let busy = $state(false);
+    let doneFor = $state(null); // playlist id that just accepted rows
+
+    $effect(() => {
+        if (open && !playlistStore.loaded) refreshPlaylists();
+    });
+
+    function toggle(e) {
+        e.stopPropagation();
+        open = !open;
+        doneFor = null;
+    }
+
+    function payload() {
+        return (tracks() ?? []).map((t) => ({
+            title: t.title ?? "",
+            artist: t.artist ?? null,
+            album: t.album ?? null,
+            duration_secs: t.durationSecs ?? t.duration_secs ?? null,
+            path: t.path ?? null,
+            art_path: t.artPath ?? t.art_path ?? null,
+        }));
+    }
+
+    async function addTo(pl) {
+        if (busy) return;
+        const rows = payload().filter((t) => t.title);
+        if (!rows.length) return;
+        busy = true;
+        try {
+            await api.playlistAddItems(pl.id, rows);
+            doneFor = pl.id;
+            await refreshPlaylists();
+            setTimeout(() => (open = false), 650);
+        } catch (e) {
+            console.error("add to playlist failed", e);
+        } finally {
+            busy = false;
+        }
+    }
+
+    async function addToNew() {
+        if (busy) return;
+        const rows = payload().filter((t) => t.title);
+        if (!rows.length) return;
+        busy = true;
+        try {
+            // Name the new playlist after what is being added when it reads
+            // like an album; otherwise fall back to the numbered default.
+            const first = rows[0];
+            const name =
+                rows.length > 1 && first.album
+                    ? first.album
+                    : rows.length === 1
+                      ? first.title
+                      : `New Playlist ${playlistStore.playlists.length + 1}`;
+            const id = await api.createPlaylist(name);
+            await api.playlistAddItems(id, rows);
+            doneFor = id;
+            await refreshPlaylists();
+            setTimeout(() => (open = false), 650);
+        } catch (e) {
+            console.error("add to new playlist failed", e);
+        } finally {
+            busy = false;
+        }
+    }
+
+    function windowClick() {
+        open = false;
+    }
+</script>
+
+<svelte:window onclick={open ? windowClick : undefined} />
+
+<div class="plm">
+    <button
+        class="plm-trigger"
+        class:compact
+        {title}
+        aria-haspopup="menu"
+        aria-expanded={open}
+        onclick={toggle}
+    >
+        <Icon name="list-plus" size={iconSize} />
+        {#if !compact}<span>Add to playlist</span>{/if}
+    </button>
+    {#if open}
+        <!-- svelte-ignore a11y_click_events_have_key_events, a11y_no_noninteractive_element_interactions -->
+        <div class="plm-menu" class:right={align === "right"} role="menu" tabindex="-1" onclick={(e) => e.stopPropagation()}>
+            <button class="plm-item new" onclick={addToNew} disabled={busy}>
+                <Icon name="plus" size={14} /> New playlist
+            </button>
+            {#if playlistStore.playlists.length}
+                <div class="plm-rule"></div>
+                <div class="plm-list">
+                    {#each playlistStore.playlists as pl (pl.id)}
+                        <button class="plm-item" onclick={() => addTo(pl)} disabled={busy}>
+                            {#if doneFor === pl.id}
+                                <span class="ok"><Icon name="check" size={14} /></span>
+                            {:else}
+                                <Icon name="playlist" size={14} />
+                            {/if}
+                            <span class="nm">{pl.name}</span>
+                            <span class="ct">{pl.track_count}</span>
+                        </button>
+                    {/each}
+                </div>
+            {/if}
+        </div>
+    {/if}
+</div>
+
+<style>
+    .plm {
+        position: relative;
+        display: inline-flex;
+    }
+    .plm-trigger {
+        display: inline-flex;
+        align-items: center;
+        gap: 7px;
+        color: inherit;
+    }
+    .plm-trigger.compact {
+        display: grid;
+        place-items: center;
+    }
+    .plm-menu {
+        position: absolute;
+        top: calc(100% + 7px);
+        left: 0;
+        min-width: 210px;
+        max-width: 270px;
+        background: var(--bg-elevated);
+        border: 1px solid var(--border);
+        border-radius: 10px;
+        padding: 5px;
+        z-index: 80;
+        box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55);
+    }
+    .plm-menu.right {
+        left: auto;
+        right: 0;
+    }
+    .plm-list {
+        max-height: 260px;
+        overflow-y: auto;
+    }
+    .plm-item {
+        display: flex;
+        align-items: center;
+        gap: 9px;
+        width: 100%;
+        padding: 8px 10px;
+        border-radius: 7px;
+        font-size: 13px;
+        font-weight: 600;
+        color: var(--text-secondary);
+        text-align: left;
+    }
+    .plm-item:hover:not(:disabled) {
+        background: var(--bg-highlight);
+        color: var(--text-primary);
+    }
+    .plm-item:disabled {
+        opacity: 0.6;
+    }
+    .plm-item .nm {
+        flex: 1;
+        min-width: 0;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+    .plm-item .ct {
+        flex: none;
+        font-size: 11px;
+        color: var(--text-muted);
+        font-variant-numeric: tabular-nums;
+    }
+    .plm-item .ok {
+        color: #3ecf7e;
+        display: grid;
+        place-items: center;
+    }
+    .plm-rule {
+        height: 1px;
+        background: var(--border);
+        margin: 5px 8px;
+    }
+</style>

src/components/Sidebar.svelte

@@ -13,6 +13,7 @@
         goToView,
         openRecentAlbum,
         getArt,
+        playlistCoverFor,
     } from "../lib/state.svelte.js";
     import * as api from "../lib/api.js";
     import Icon from "./Icon.svelte";
@@ -145,6 +146,15 @@
     $effect(() => {
         if (!recentsStore.loaded) refreshRecents();
     });
+
+    // Pinned playlists ride between the nav and the history — quick access
+    // to the lists the user chose to keep close, with their covers.
+    const pinnedPlaylists = $derived(
+        playlistStore.playlists.filter((p) => p.pinned).slice(0, 6),
+    );
+    $effect(() => {
+        for (const pl of pinnedPlaylists) void playlistCoverFor(pl);
+    });
 </script>
 
 <nav class="sidebar" class:collapsed={ui.sidebarCollapsed}>
@@ -226,6 +236,28 @@
             </button>
         {/each}
 
+        {#each pinnedPlaylists as pl (pl.id)}
+            <button
+                class="rec"
+                class:on={ui.view === "playlist" && ui.playlistId === pl.id}
+                title="{pl.name} — pinned playlist"
+                onclick={() => goToView("playlist", { playlistId: pl.id, label: pl.name })}
+            >
+                {#if playlistStore.covers[pl.id]}
+                    <img src={playlistStore.covers[pl.id]} alt="" draggable="false" />
+                {:else}
+                    <span class="art-placeholder"><Icon name="playlist" size={15} /></span>
+                {/if}
+                <span class="tx">
+                    <span class="n">
+                        <span class="pin-mini" aria-hidden="true"><Icon name="pin" size={10} /></span>
+                        {pl.name}
+                    </span>
+                    <span class="s">{pl.track_count} {pl.track_count === 1 ? "track" : "tracks"}</span>
+                </span>
+            </button>
+        {/each}
+
         <div class="rule"></div>
 
         {#each recentRows as row (row.key)}
@@ -698,6 +730,14 @@
         opacity: 0;
     }
 
+    /* Pinned playlist rows share the recents' whole construction; the only
+       addition is the tiny pin riding the name, which fades with the text. */
+    .pin-mini {
+        display: inline-flex;
+        color: var(--text-muted);
+        flex: none;
+    }
+
     .eq {
         display: inline-flex;
         align-items: flex-end;

src/lib/api.js

@@ -140,14 +140,85 @@ export const getSettings = () => invoke("get_settings");
 export const setSettings = (patch) => invoke("set_settings", patch);
 export const forgetCredentials = () => invoke("forget_credentials");
 export const pickFolder = () => invoke("pick_folder");
+// ---- playlists (see src-tauri/src/playlists.rs) ---------------------------
+// Rows are OCCURRENCES with their own ids: the same recording may appear
+// twice, and every mutation addresses item ids, never positions.
 export const listPlaylists = () => invoke("list_playlists");
-export const createPlaylist = (name) => invoke("create_playlist", { name });
+export const createPlaylist = (name, kind = null) => invoke("create_playlist", { name, kind });
+export const renamePlaylist = (id, name) => invoke("rename_playlist", { id, name });
+export const setPlaylistDescription = (id, description) =>
+    invoke("set_playlist_description", { id, description: description ?? null });
+export const setPlaylistPinned = (id, pinned) => invoke("set_playlist_pinned", { id, pinned });
+export const duplicatePlaylist = (id, name) => invoke("duplicate_playlist", { id, name });
 export const deletePlaylist = (id) => invoke("delete_playlist", { id });
-export const playlistTracks = (id) => invoke("playlist_tracks", { id });
-export const addToPlaylist = (playlistId, tracks) =>
-    invoke("add_to_playlist", { playlistId, tracks });
-export const removeFromPlaylist = (playlistId, position) =>
-    invoke("remove_from_playlist", { playlistId, position });
+export const playlistItems = (id) => invoke("playlist_items", { id });
+export const playlistAddItems = (playlistId, items, at = null) =>
+    invoke("playlist_add_items", { playlistId, items, at });
+export const playlistRemoveItems = (playlistId, itemIds) =>
+    invoke("playlist_remove_items", { playlistId, itemIds });
+export const playlistSetOrder = (playlistId, orderedIds) =>
+    invoke("playlist_set_order", { playlistId, orderedIds });
+// Repair one row: fields null = leave as stored; path non-null relinks the
+// row to a playable file.
+export const playlistRelinkItem = (playlistId, itemId, fields = {}) =>
+    invoke("playlist_relink_item", {
+        playlistId,
+        itemId,
+        title: fields.title ?? null,
+        artist: fields.artist ?? null,
+        album: fields.album ?? null,
+        durationSecs: fields.durationSecs ?? null,
+        path: fields.path ?? null,
+        artPath: fields.artPath ?? null,
+    });
+// Cover as a data URL: custom master, else composed mosaic, else null.
+export const playlistCover = (id, maxEdge = null) =>
+    invoke("playlist_cover", { id, maxEdge });
+export const playlistCoverPick = (id) => invoke("playlist_cover_pick", { id });
+export const playlistCoverClear = (id) => invoke("playlist_cover_clear", { id });
+// Import: probe opens a file dialog and stages a reviewed draft; text stages
+// a pasted tracklist; commit writes the accepted draft in one transaction.
+export const playlistImportProbe = () => invoke("playlist_import_probe");
+export const playlistImportFolder = () => invoke("playlist_import_folder");
+export const playlistImportText = (text) => invoke("playlist_import_text", { text });
+export const playlistImportCommit = (name, description, kind, entries) =>
+    invoke("playlist_import_commit", { name, description: description ?? null, kind, entries });
+// Export via a save dialog; format ∈ m3u8 | xspf | csv | json. Resolves to
+// the written path, or null when the dialog was cancelled.
+export const playlistExport = (id, format) => invoke("playlist_export", { id, format });
+// Local-library candidates for the unresolved-row repair panel.
+export const libraryTrackSearch = (query) => invoke("library_track_search", { query });
+
+// ---- lyrics (see src-tauri/src/lyrics.rs) ----------------------------------
+export const lyricsGet = (args) =>
+    invoke("lyrics_get", {
+        title: args.title,
+        artist: args.artist,
+        album: args.album ?? null,
+        durationSecs: args.durationSecs ?? null,
+        path: args.path ?? null,
+        refresh: args.refresh ?? null,
+    });
+export const lyricsSearch = (title, artist) => invoke("lyrics_search", { title, artist });
+export const lyricsSelect = (title, artist, durationSecs, candidateId) =>
+    invoke("lyrics_select", { title, artist, durationSecs: durationSecs ?? null, candidateId });
+export const lyricsSetOffset = (title, artist, durationSecs, offsetMs) =>
+    invoke("lyrics_set_offset", { title, artist, durationSecs: durationSecs ?? null, offsetMs });
+export const lyricsSaveText = (title, artist, durationSecs, text) =>
+    invoke("lyrics_save_text", { title, artist, durationSecs: durationSecs ?? null, text });
+export const lyricsClear = (title, artist, durationSecs) =>
+    invoke("lyrics_clear", { title, artist, durationSecs: durationSecs ?? null });
+export const lyricsSetAutoSync = (title, artist, durationSecs, enabled) =>
+    invoke("lyrics_set_auto_sync", { title, artist, durationSecs: durationSecs ?? null, enabled });
+// Offline vocal-reduction render (band-limited center cancel — honest DSP,
+// not a learned separator). Resolves to { path, cached } of a playable WAV.
+export const lyricsPrepareInstrumental = (path) =>
+    invoke("lyrics_prepare_instrumental", { path });
+// Vocal-band activity envelope for the sync editor ({ frameMs, frames }).
+export const lyricsVocalActivity = (path) => invoke("lyrics_vocal_activity", { path });
+// Persist hand-synced lines as the track's own document (wins the waterfall).
+export const lyricsSaveLines = (title, artist, durationSecs, lines) =>
+    invoke("lyrics_save_lines", { title, artist, durationSecs: durationSecs ?? null, lines });
 export const catalogSearch = (query) => invoke("catalog_search", { query });
 export const rememberFusedArtistPortrait = (artistId, portrait) =>
     invoke("remember_fused_artist_portrait", { artistId, portrait });
@@ -232,6 +303,11 @@ export const debugStats = () => invoke("debug_stats");
 // source folder is never written to.
 export const importScan = (root) => invoke("import_scan", { root });
 export const importSessionGet = () => invoke("import_session_get");
+// The source folder relative to the library folder, and back again. Saving
+// both is what lets a review started on one machine resume on another after
+// the drive lands at a different letter.
+export const importPortableRoot = (root) => invoke("import_portable_root", { root });
+export const importResolveRoot = (saved, rel) => invoke("import_resolve_root", { saved, rel });
 export const importSessionSet = (state) => invoke("import_session_set", { state });
 export const importSessionClear = () => invoke("import_session_clear");
 export const importGetDest = () => invoke("import_get_dest");
@@ -239,11 +315,29 @@ export const importSetDest = (dir, layout = null) => invoke("import_set_dest", {
 export const importApply = (sourceRoot, albums) => invoke("import_apply", { sourceRoot, albums });
 // On-demand per-record identification (Deezer try-list → MB fallback) and
 // the artwork panel's cover report. Both read-only.
-export const importIdentify = (artist, title) => invoke("import_identify", { artist, title });
+// `title` is the record's own claim (tags); `folder` is the second witness,
+// asked after it — a record whose tags are wrong still has its folder name.
+// `shape` is everything ELSE the scan knows — track count, track titles, year,
+// and where the files are so Rust can hash the record's own cover. That is what
+// the discography pass compares when no phrase can find the record; the cover
+// itself never crosses IPC (a master can be 8 MB).
+export const importIdentify = (artist, title, folder = null, shape = {}) =>
+    invoke("import_identify", {
+        artist, title, folder,
+        tracks: shape.tracks ?? null,
+        trackTitles: shape.trackTitles ?? null,
+        year: shape.year ?? null,
+        sourceRoot: shape.sourceRoot ?? null,
+        rel: shape.rel ?? null,
+        // Bounds the cover hash to the record's own audio — a folded release
+        // gathers from these, an ordinary one from its folder alone.
+        parts: shape.parts ?? null,
+    });
 export const importCoverReport = (artist, title, referenceUrl) =>
     invoke("import_cover_report", { artist, title, referenceUrl });
 // The record's own artwork, measured (embedded first, else folder images).
-export const importLocalArt = (sourceRoot, rel) => invoke("import_local_art", { sourceRoot, rel });
+export const importLocalArt = (sourceRoot, rel, parts) =>
+    invoke("import_local_art", { sourceRoot, rel, parts });
 // Prune rows whose files are gone, then index anything new — the real rescan.
 export const rescanLibrary = () => invoke("rescan_library");
 // Download a found album copy into (Cache)\_audition\<rel>\ for the version
@@ -252,6 +346,15 @@ export const rescanLibrary = () => invoke("rescan_library");
 export const importAudition = (username, rel, files, startIndex = 0) =>
     invoke("import_audition", { username, rel, files, startIndex });
 export const onImportAudition = (cb) => listen("import:audition", (e) => cb(e.payload));
+// Which of a found copy's files the pen does not (fully) hold. Transfers die
+// with the app and the arrived-count dies with them; the files on disk are
+// what is left to ask.
+export const importAuditionMissing = (rel, files) =>
+    invoke("import_audition_missing", { rel, files });
+// Empty a record's pen when its peer is abandoned; returns the bytes freed.
+// The pen is keyed by RECORD, so without this the dropped peer's files sit
+// beside the replacement's until the session is cleared.
+export const importAuditionClear = (rel) => invoke("import_audition_clear", { rel });
 // Measured facts about one audio file (the version card's quality chips).
 export const importProbeFile = (path) => invoke("import_probe_file", { path });
 export const onImportScan = (cb) => listen("import:scan", (e) => cb(e.payload));

src/lib/import-query.js

@@ -0,0 +1,73 @@
+// How the import finder asks when it is not ALLOWED to ask.
+//
+// The Soulseek server drops a search outright when the query carries every
+// word of one of its excluded phrases. Measured 2026-08-11 against the live
+// server, with the record's own copies provably on the network:
+//
+//   animal collective merriweather        578 peers · 2,664 FLAC files
+//   merriweather pavilion                 683 peers
+//   post pavilion                         712 peers
+//   merriweather post pavilion              0 peers   <- every time
+//   pavilion merriweather post              0 peers   <- order is irrelevant
+//   merriweather post pavilion flac         0 peers   <- extra terms don't help
+//
+// The published exclusions behave identically ("village people" 0, "bryan
+// adams" 0, "village people flac" 0, while "abba gold" answers with 608), so
+// this is that same mechanism — but the server publishes only SOME of its
+// list. `sanitizeSearchQuery` strips the phrases it does publish; an
+// unpublished one like this album's title reaches the wire and is swallowed.
+//
+// Nothing here can make the server answer a refused query. What it CAN do is
+// ask a shorter question the server does answer, and then apply the part we
+// were not allowed to say to the answers, where no server is involved.
+
+const STOPWORDS = new Set(["the", "a", "an", "and", "or", "of", "in", "on", "at", "to", "for", "with"]);
+
+/** Words, punctuation folded away. `&` and `-` are separators, not letters, so
+ *  "Rock & Roll" and "Rock-n-Roll" both yield asking words rather than one
+ *  token nothing will match. */
+export function queryWords(s) {
+    return String(s ?? "")
+        .toLowerCase()
+        .replace(/[^\p{L}\p{N}]+/gu, " ")
+        .split(/\s+/)
+        .filter(Boolean);
+}
+
+/** The record's name with its last word dropped — the shortest change that
+ *  breaks the refused word-set while still naming the record.
+ *
+ *  Trailing stopwords go with it: "The Dark Side of the Moon" without "moon"
+ *  is "the dark side of the", which asks the network for three words that
+ *  carry no meaning and narrow the result set for nothing.
+ *
+ *  Returns "" when there is nothing left worth asking. A one-word name
+ *  shortens to nothing at all, and a bare artist query asks the network for
+ *  that artist's entire discography — the same thing `findQueries` refuses
+ *  to do. */
+export function shortenName(name) {
+    const w = queryWords(name);
+    if (w.length < 2) return "";
+    w.pop();
+    while (w.length && STOPWORDS.has(w[w.length - 1])) w.pop();
+    return w.join(" ");
+}
+
+/** Does this peer's path claim to BE the record we could not ask for? Every
+ *  word of the full name has to appear in it.
+ *
+ *  This is the half of the question the server was not allowed to answer, and
+ *  it is what keeps the shortened query honest: "animal collective merriweather
+ *  post" also matches a live set recorded AT Merriweather Post Pavilion, and
+ *  the venue is in the path of every bootleg taped there.
+ *
+ *  Deliberately whole-word, not substring: "Pavillion" is not "Pavilion", and
+ *  a folder that misspells the record is refused rather than guessed at. That
+ *  costs a few real copies whose owners cannot spell; accepting near-misses
+ *  costs correctness, and there is no way to tell the two apart from here. */
+export function pathHasTitle(path, name) {
+    const need = queryWords(name);
+    if (!need.length) return false;
+    const have = new Set(queryWords(path));
+    return need.every((w) => have.has(w));
+}

src/lib/import-title.js

@@ -27,8 +27,36 @@
  *
  *  1. Deezer try-list, MusicBrainz fallback.
  *  2. + the artist's own catalogue, ranked by title similarity — finds records
- *     whose folder name no release carries ("1989 Pauls Boutique"). */
-export const IDENTIFY_ENGINE = 2;
+ *     whose folder name no release carries ("1989 Pauls Boutique").
+ *  3. + the artist the TAGS name, asked when the folder's artist found nothing
+ *     or the wrong record, and + a try-list that refuses to strip a title down
+ *     to its catalogue number ("Band Of Gypsys (SICP 2643)" → "(SICP 2643)").
+ *  4. + the title without a trailing release-type word ("Willoughby's Beach EP"
+ *     → "Willoughby's Beach"). Both providers require every word of the
+ *     phrase, so the one appended word hid a record each of them holds.
+ *  5. + the FOLDER as a second witness, asked after the record's own claim.
+ *     Tags carry typos the folder does not ("Nonagon Infiniry" on all nine
+ *     files, in a correctly-spelled folder), and until now one wrong tag was
+ *     the only thing any provider was ever asked about.
+ *  6. + the record's TRACK COUNT breaks the tie when one title names several
+ *     MusicBrainz release groups ("Murder of the Universe" is a 21-track Album
+ *     and a 1-track Single, both scored 100, in an unstable order), and a
+ *     provider request that FAILED no longer caches as "nothing found".
+ *  7. The last resort stopped being a title search dressed as a comparison. It
+ *     ranks the artist's WHOLE MusicBrainz discography — complete, where
+ *     Deezer's listing omitted EPs entirely — and decides on every fact the
+ *     scan has: wording, track count, year, the TRACKLIST, and the record's own
+ *     ARTWORK hashed against the discography's covers. A name is one fact about
+ *     a record and the one most often wrong; `Rock Bottom 7"` scores 0.667
+ *     against the release actually called "Rock Bottom / Octopus", and 2 of 2
+ *     on its songs.
+ *
+ *  BUMP THIS AFTER THE RUST BUILD LANDS, never before. Vite hot-reloads this
+ *  constant instantly while the capability it describes lives in
+ *  `metadata::identify_titles`, so bumping it against a running old binary
+ *  makes that binary sweep the negatives and re-stamp the record on screen as
+ *  freshly looked at by code that learned nothing. */
+export const IDENTIFY_ENGINE = 7;
 
 /** The value most of the list agrees on, ignoring blanks. Ties go to the first
  *  value seen, which keeps the result stable for a re-render. */

src/lib/lyric-sync.js

@@ -0,0 +1,108 @@
+// Rough line-timing estimation — plain lyrics + a measured vocal-activity
+// envelope → ESTIMATED line starts, as a starting point for the tap-to-sync
+// editor. Never presented as finished timing.
+//
+// The method deliberately stays above the research doc's forbidden floor
+// ("never estimate line positions by evenly distributing text across song
+// duration"): lines are laid out only across MEASURED vocal-active segments,
+// weighted by line length, and when the measurement shows nothing usable the
+// generator refuses instead of guessing. Real generated timing (ASR anchors
+// + forced alignment, per the research) is a later, model-gated feature.
+//
+// Pure functions, no imports — unit-tested by tests/lyrics/sync.test.mjs.
+
+/** Hysteresis segmentation of a 0..1 activity envelope.
+ * Returns [{ startMs, endMs }], merged and pruned. */
+export function activeSegments(frames, frameMs, opts = {}) {
+    const on = opts.on ?? 0.32; // enter singing
+    const off = opts.off ?? 0.16; // leave singing…
+    const offRunMs = opts.offRunMs ?? 900; // …only after this long below
+    const minSegMs = opts.minSegMs ?? 1200;
+    const mergeGapMs = opts.mergeGapMs ?? 700;
+
+    const segments = [];
+    let start = null;
+    let belowRun = 0;
+    for (let i = 0; i < frames.length; i++) {
+        const v = frames[i];
+        if (start == null) {
+            if (v >= on) {
+                start = i;
+                belowRun = 0;
+            }
+        } else if (v < off) {
+            belowRun += frameMs;
+            if (belowRun >= offRunMs) {
+                const end = i * frameMs - belowRun + frameMs;
+                segments.push({ startMs: start * frameMs, endMs: end });
+                start = null;
+                belowRun = 0;
+            }
+        } else {
+            belowRun = 0;
+        }
+    }
+    if (start != null) {
+        segments.push({ startMs: start * frameMs, endMs: frames.length * frameMs });
+    }
+    // Merge close neighbours, then drop slivers.
+    const merged = [];
+    for (const seg of segments) {
+        const last = merged[merged.length - 1];
+        if (last && seg.startMs - last.endMs <= mergeGapMs) {
+            last.endMs = seg.endMs;
+        } else {
+            merged.push({ ...seg });
+        }
+    }
+    return merged.filter((s) => s.endMs - s.startMs >= minSegMs);
+}
+
+/** Plain text → the lines worth timing (section labels dropped). */
+export function lyricLinesOf(plainText) {
+    return String(plainText ?? "")
+        .split("\n")
+        .map((l) => l.trim())
+        .filter((l) => l.length > 0)
+        .filter((l) => !/^\[.*\]$/.test(l));
+}
+
+/** Lay `lines` across `segments` by character weight over the concatenated
+ * active timeline. Returns [{ time_ms, text }] (monotonic, every start
+ * inside an active segment), or null when there is nothing to lay onto. */
+export function distributeLines(lines, segments) {
+    if (!lines.length || !segments.length) return null;
+    const activeTotal = segments.reduce((sum, s) => sum + (s.endMs - s.startMs), 0);
+    if (activeTotal < 4000) return null;
+    const weight = (line) => Math.max(line.length, 8);
+    const totalWeight = lines.reduce((sum, l) => sum + weight(l), 0);
+    // virtual position (0..activeTotal) → real ms via the segment list.
+    const toReal = (virtual) => {
+        let left = virtual;
+        for (const seg of segments) {
+            const len = seg.endMs - seg.startMs;
+            if (left <= len) return seg.startMs + left;
+            left -= len;
+        }
+        return segments[segments.length - 1].endMs;
+    };
+    const out = [];
+    let cumulative = 0;
+    for (const line of lines) {
+        const virtual = (cumulative / totalWeight) * activeTotal;
+        out.push({ time_ms: Math.round(toReal(virtual)), text: line });
+        cumulative += weight(line);
+    }
+    // Monotonic by construction, but rounding can tie neighbours; nudge.
+    for (let i = 1; i < out.length; i++) {
+        if (out[i].time_ms <= out[i - 1].time_ms) out[i].time_ms = out[i - 1].time_ms + 300;
+    }
+    return out;
+}
+
+/** The whole rough pass. Returns [{ time_ms, text }] or null (refused). */
+export function roughSync(plainText, frames, frameMs) {
+    const lines = lyricLinesOf(plainText);
+    const segments = activeSegments(frames ?? [], frameMs ?? 100);
+    return distributeLines(lines, segments);
+}

src/lib/state.svelte.js

@@ -227,6 +227,8 @@ export const importStatus = $state({
     label: "", // applied: the "· 12 GB" tail; otherwise unused
     skipped: 0, // applied: records nothing was written for — the toast must
     // say so, because "Imported 0 records" on its own reads as a dead end
+    error: "", // error: what went wrong, in words. "The import hit a problem"
+    // is not a reason, and a silent failure is not even that.
 });
 
 /** A paused import's presence on the Library page: the Import button wears
@@ -267,6 +269,8 @@ export const ui = $state({
     // window is minimized. This is the authoritative shared activity gate for
     // hidden animation, canvas, carousel, and high-frequency position work.
     windowActive: true,
+    // Fullscreen lyrics overlay (LyricsOverlay.svelte) over the content pane.
+    lyricsFull: false,
 });
 
 export function toggleNowPlaying() {
@@ -311,16 +315,49 @@ export const libraryStore = $state({
 
 export const playlistStore = $state({
     playlists: [],
+    loaded: false,
+    // Cover data URLs keyed by playlist id. Entries are revision-stamped so a
+    // mutated playlist (new rows → new mosaic) refetches while an untouched
+    // one costs nothing on re-render.
+    covers: {},
 });
 
+// revision the cached cover was composed against, and in-flight dedupe.
+const playlistCoverRev = new Map();
+const playlistCoverInflight = new Map();
+
 export async function refreshPlaylists() {
     try {
         playlistStore.playlists = await api.listPlaylists();
+        for (const pl of playlistStore.playlists) void playlistCoverFor(pl);
     } catch {
         // backend not available
+    } finally {
+        playlistStore.loaded = true;
     }
 }
 
+/// Resolve (and cache) the cover for one playlist row from `listPlaylists`.
+/// Reads land in `playlistStore.covers[id]`; null means "no cover — draw the
+/// gradient fallback".
+export async function playlistCoverFor(pl, maxEdge = 512) {
+    const id = pl.id;
+    const cached = playlistStore.covers[id];
+    if (cached !== undefined && playlistCoverRev.get(id) === pl.revision) return cached;
+    if (playlistCoverInflight.has(id)) return playlistCoverInflight.get(id);
+    const req = api
+        .playlistCover(id, maxEdge)
+        .then((url) => {
+            playlistStore.covers[id] = url ?? null;
+            playlistCoverRev.set(id, pl.revision);
+            return url ?? null;
+        })
+        .catch(() => null)
+        .finally(() => playlistCoverInflight.delete(id));
+    playlistCoverInflight.set(id, req);
+    return req;
+}
+
 // ---- recently played (the sidebar's list) ----
 // A play row is opened after ~1s of audio, so without a floor this list is a
 // log of skips. 45s is the floor the live table was measured against.
@@ -3691,9 +3728,18 @@ export const RESOLVER_AUDIO_QUALITY = {
 // Formats that decode progressively while the file is still downloading.
 // MP4-family files (m4a/aac) put their index at the end and only play once
 // complete, so they're save-only.
-const RESOLVER_STREAMABLE = new Set(["flac", "mp3", "ogg", "opus", "wav", "aiff"]);
+//
+// `opus` was here and must not be: this build has no Opus decoder, so the
+// resolver would pick an Opus source to stream, download it, and fail at the
+// moment of play. Streamable is a subset of PLAYABLE, never a superset —
+// see crates/audio-formats.
+const RESOLVER_STREAMABLE = new Set(["flac", "mp3", "ogg", "oga", "wav", "wave", "aiff", "aif"]);
 
-const LOSSLESS_EXTS = new Set(["flac", "ape", "wav", "aiff", "alac", "wv"]);
+// Lossless for LABELLING — what the file claims to be, which is a different
+// question from whether we can decode it. `.ape` and `.wv` are genuinely
+// lossless and genuinely unplayable here; a peer's file is still worth naming
+// accurately in search results.
+const LOSSLESS_EXTS = new Set(["flac", "ape", "wav", "wave", "aiff", "aif", "alac", "wv", "tta"]);
 
 // User source-selection preferences, independent per mode. Loaded from
 // settings at startup and refreshed by the Settings view after a commit;
@@ -5031,10 +5077,24 @@ export function filesForGroup(key) {
     return searchFiles.get(key)?.files ?? [];
 }
 
+// Mirrors crates/audio-formats: everything recognised as audio, playable or
+// not. Kept in sync by `audio_format_support`, which the backend answers from
+// the same table the scanner and share index use.
 export const AUDIO_EXTS = new Set([
-    "flac", "mp3", "m4a", "ogg", "opus", "wav", "aac", "wma", "ape", "aiff",
+    "flac", "mp3", "mp2", "mp1", "m4a", "m4b", "mp4", "m4r", "aac",
+    "ogg", "oga", "wav", "wave", "aiff", "aif", "aifc", "caf", "mka", "webm",
+    "opus", "wma", "ape", "wv", "mpc", "tta", "shn", "dsf", "dff", "spx", "ra", "au", "amr",
 ]);
 
+// Recognised but with no decoder in this build. Shown, searchable, shareable
+// and downloadable — never handed to the player, which refuses them anyway.
+export const UNPLAYABLE_EXTS = new Set([
+    "opus", "wma", "ape", "wv", "mpc", "tta", "shn", "dsf", "dff", "spx", "ra", "au", "amr",
+]);
+export const isPlayableExt = (ext) =>
+    AUDIO_EXTS.has(String(ext ?? "").toLowerCase())
+    && !UNPLAYABLE_EXTS.has(String(ext ?? "").toLowerCase());
+
 export const downloads = $state({
     // id -> download payload (latest update wins)
     items: {},
@@ -5771,9 +5831,14 @@ export function playAlbum(tracks, subLabel, start = 0, artPath = null) {
         title: t.title,
         sub: subLabel,
         artist: t.artist ?? null,
+        album: t.album ?? null,
         duration: t.duration_secs ?? null,
         art: t.art_path ?? artPath,
         quality: localQuality(t),
+        // Which playlist OCCURRENCE this queue item came from, so the playlist
+        // page highlights exactly the row that is playing — a recording that
+        // appears twice must light up once. Null for album playback.
+        plItemId: t.plItemId ?? null,
     }));
     player.catalogRef = { albumId: null, trackId: null };
     playQueueIndex(start);
@@ -6588,5 +6653,6 @@ if (import.meta.env.DEV) {
         playLocalFile, playAlbum, togglePlayPause, nextTrack, prevTrack,
         catalogGo, refreshLibrary, refreshRecents,
         autoConnect, refreshSourcePrefs, _sourceAudit, sourcePrefs,
+        playlistStore, refreshPlaylists, goToView,
     };
 }

src/views/Library.svelte

@@ -22,6 +22,7 @@
     import { tick } from "svelte";
     import { fade } from "svelte/transition";
     import Icon from "../components/Icon.svelte";
+    import PlaylistMenu from "../components/PlaylistMenu.svelte";
     import * as api from "../lib/api.js";
     import {
         libraryStore,
@@ -94,14 +95,32 @@
     // the same join the artist page's own "in your library" ticks already
     // make (catalogTrackOwnership); identity of RECORDS is never guessed.
     let followsByName = $state({});     // normKey(name) -> { artistId, name }
-    // artist name -> { total } — persisted so counts survive a restart and the
-    // shelf head can say "9 of 29" without a fetch. Rows are session-only.
+
+    /** "Same artist" for filing purposes, and it is not a new rule: the library
+     *  already groups artist portraits with `GROUP BY artist COLLATE NOCASE`
+     *  (crates/library/src/lib.rs:321), so the shelves fold exactly as wide as
+     *  the backend does. Measured on this library, case alone splits 5 artists
+     *  (King Gizzard "& The"/"& the", Lorn/LORN, Mac DeMarco/Demarco, Boards
+     *  Of/of Canada, My Bloody Valentine) and the stricter punctuation-stripping
+     *  normKey merges nothing beyond those — so the wider key would buy no shelf
+     *  and only risk fusing two artists whose names differ by a mark. */
+    const foldKey = (s) => (s ?? "").toLowerCase();
+
+    // foldKey(artist) -> { total } — persisted so counts survive a restart and
+    // the shelf head can say "9 of 29" without a fetch. Rows are session-only.
     const GAPS_KEY = "library.gaps.v1";
     let gapTotals = $state((() => {
-        try { return JSON.parse(localStorage.getItem(GAPS_KEY)) ?? {}; } catch { return {}; }
+        try {
+            const saved = JSON.parse(localStorage.getItem(GAPS_KEY)) ?? {};
+            // Written under the raw shelf name before shelves folded by case,
+            // so a total banked as "King Gizzard & the Lizard Wizard" is still
+            // found now the shelf is titled "& The". Folding on load rather
+            // than at every read keeps one shape in memory.
+            return Object.fromEntries(Object.entries(saved).map(([k, v]) => [foldKey(k), v]));
+        } catch { return {}; }
     })());
-    let gapRows = $state({});           // artist name -> catalog rows not owned
-    let gapOpen = $state({});           // artist name -> line expanded
+    let gapRows = $state({});           // foldKey(artist) -> catalog rows not owned
+    let gapOpen = $state({});           // foldKey(artist) -> line expanded
     let gapLoading = $state({});
 
     const normKey = (s) => (s ?? "").toLowerCase().replace(/[^a-z0-9]/g, "");
@@ -138,14 +157,18 @@
     }
 
     async function toggleGaps(artistName) {
-        if (gapOpen[artistName]) {
-            gapOpen = { ...gapOpen, [artistName]: false };
+        // Keyed by the FOLD, not by the shelf's title: the total was the one
+        // thing still filed under whichever spelling happened to be clicked,
+        // which is why only one of two King Gizzard shelves read "8 of 42".
+        const key = foldKey(artistName);
+        if (gapOpen[key]) {
+            gapOpen = { ...gapOpen, [key]: false };
             return;
         }
         const follow = followFor(artistName);
         if (!follow) return;
-        if (!gapRows[artistName] && !gapLoading[artistName]) {
-            gapLoading = { ...gapLoading, [artistName]: true };
+        if (!gapRows[key] && !gapLoading[key]) {
+            gapLoading = { ...gapLoading, [key]: true };
             try {
                 const page = await getCatalogArtistPage(follow.artistId);
                 const released = (page?.albums ?? []).filter((a) => !isUpcomingRow(a));
@@ -156,15 +179,15 @@
                 );
                 gapRows = {
                     ...gapRows,
-                    [artistName]: released.filter((r) => !ownedTitles.has(normKey(r.title))),
+                    [key]: released.filter((r) => !ownedTitles.has(normKey(r.title))),
                 };
-                gapTotals = { ...gapTotals, [artistName]: { total: released.length } };
+                gapTotals = { ...gapTotals, [key]: { total: released.length } };
                 try { localStorage.setItem(GAPS_KEY, JSON.stringify(gapTotals)); } catch { /* ignore */ }
             } catch { /* the line stays collapsed; nothing is invented */ }
-            gapLoading = { ...gapLoading, [artistName]: false };
+            gapLoading = { ...gapLoading, [key]: false };
         }
-        if (gapRows[artistName]?.length || gapLoading[artistName] === false) {
-            gapOpen = { ...gapOpen, [artistName]: true };
+        if (gapRows[key]?.length || gapLoading[key] === false) {
+            gapOpen = { ...gapOpen, [key]: true };
         }
     }
 
@@ -309,7 +332,10 @@
 
     // ---- groupings --------------------------------------------------------
     const GROUPS = {
-        artist: { label: "Artist", of: (a) => a.artist || "Unknown Artist" },
+        // `of` names the shelf, `keyOf` decides which shelf a record lands on.
+        // They differ for Artist alone: two spellings of one name are one
+        // artist, so the key folds and shelfName() picks the title.
+        artist: { label: "Artist", of: (a) => a.artist || "Unknown Artist", keyOf: (a) => foldKey(a.artist || "Unknown Artist") },
         decade: { label: "Decade", of: (a) => (a.year ? `${Math.floor(a.year / 10) * 10}s` : "No year") },
         format: {
             label: "Format",
@@ -360,12 +386,37 @@
     };
 
     function completeness(artist) {
-        const total = gapTotals[artist]?.total || 0;
+        const total = gapTotals[foldKey(artist)]?.total || 0;
         if (!total) return 1;
-        const own = rows.filter((a) => a.artist === artist).length;
+        const own = rows.filter((a) => foldKey(a.artist) === foldKey(artist)).length;
         return Math.min(1, own / total);
     }
 
+    /** The one spelling a folded shelf is filed under.
+     *
+     *  An anchored follow's own name wins, because that is the catalogue's
+     *  spelling and the same anchor the rest of the page already trusts. With
+     *  no anchor there is nothing authoritative to appeal to, so the records
+     *  vote: the spelling on the most albums, ties broken by sort order so a
+     *  shelf never renames itself between loads.
+     *
+     *  A shelf with ONE spelling keeps it untouched — including when a follow
+     *  disagrees. Renaming a shelf that was never split is a change nobody
+     *  asked for, and this only exists to reunite the ones that were. */
+    function shelfName(list) {
+        const counts = new Map();
+        for (const a of list) {
+            const n = a.artist || "Unknown Artist";
+            counts.set(n, (counts.get(n) || 0) + 1);
+        }
+        const spellings = [...counts.keys()];
+        if (spellings.length === 1) return spellings[0];
+        const follow = followFor(spellings[0]);
+        if (follow?.name) return follow.name;
+        return [...counts.entries()]
+            .sort((x, y) => y[1] - x[1] || x[0].localeCompare(y[0]))[0][0];
+    }
+
     function sortList(list) {
         const out = [...list].sort(SORTS[sortKey].cmp);
         return desc ? out : out.reverse();
@@ -376,13 +427,25 @@
         if (group === "none") return [["", sortList(corpus)]];
         const by = new Map();
         for (const a of corpus) {
-            const k = g.of(a);
+            const k = (g.keyOf ?? g.of)(a);
             if (!by.has(k)) by.set(k, []);
             by.get(k).push(a);
         }
+        // An artist shelf is keyed by the FOLD, which is not a name, so it takes
+        // the title shelfName() picks. Every other grouping's key already IS its
+        // heading. Two folds can still title alike — followFor() joins on the
+        // coarser normKey, so "AC/DC" and "ACDC" would both take one follow's
+        // name — and that is the same artist by the app's own rule, so the
+        // shelves join rather than one silently replacing the other.
+        const named = new Map();
+        for (const [k, list] of by) {
+            const title = group === "artist" ? shelfName(list) : k;
+            const prev = named.get(title);
+            if (prev) prev.push(...list); else named.set(title, list);
+        }
         // Added is a DATE grouping: newest month first, by the month the key
         // names — a string sort put April 2025 above August 2024.
-        const keys = [...by.keys()].sort(group === "rtype"
+        const keys = [...named.keys()].sort(group === "rtype"
             ? (x, y) => CAT_ORDER.findIndex((c) => CAT_LABEL[c] === x)
                 - CAT_ORDER.findIndex((c) => CAT_LABEL[c] === y)
             : group === "artist"
@@ -394,7 +457,7 @@
         if (group === "artist" && sortKey === "complete") {
             keys.sort((x, y) => completeness(x) - completeness(y));
         }
-        return keys.map((k) => [k, sortList(by.get(k))]);
+        return keys.map((k) => [k, sortList(named.get(k))]);
     });
 
     // Albums, EPs and singles under their own headings INSIDE an artist — the
@@ -414,7 +477,7 @@
     // ---- the derived stat row --------------------------------------------
     const totals = $derived.by(() => ({
         albums: corpus.length,
-        artists: new Set(corpus.map((a) => a.artist)).size,
+        artists: new Set(corpus.map((a) => foldKey(a.artist || "Unknown Artist"))).size,
         tracks: corpus.reduce((n, a) => n + (a.track_count || 0), 0),
         secs: corpus.reduce((n, a) => n + a.secs, 0),
         bytes: corpus.reduce((n, a) => n + a.bytes, 0),
@@ -1151,6 +1214,25 @@
             if (tracks.length) playAlbum(tracks, `${album.artist} — ${album.title}`, 0, album.art_path);
         } catch { /* backend unavailable */ }
     }
+    // Disc-aware view of the open tracklist — the artist page's own treatment
+    // (CatalogArtist's `openDiscs`), so a multi-disc record reads the same
+    // wherever you meet it: quiet disc rules, and each disc numbering from 1.
+    //
+    // `i` is the track's index in `openTracks`, kept alongside because that is
+    // what playback counts from: grouping the rows must not renumber the queue.
+    const openDiscs = $derived.by(() => {
+        const by = new Map();
+        openTracks.forEach((t, i) => {
+            const disc = t.disc_no ?? 1;
+            if (!by.has(disc)) by.set(disc, []);
+            by.get(disc).push({ t, i });
+        });
+        return [...by.entries()]
+            .sort((a, b) => a[0] - b[0])
+            .map(([disc, rows]) => ({ disc, rows }));
+    });
+    const multiDisc = $derived(openDiscs.length > 1);
+
     const isPlayingTrack = (t) =>
         player.track?.source === "local" && player.track?.path === t.path;
     function folderOf(tracks) {
@@ -1571,6 +1653,22 @@
                                 <button class="pill grow" title="Play" onclick={() => playOpen(0)} disabled={!openTracks.length}>
                                     <Icon name="play" size={12} /> Play
                                 </button>
+                                {#if openTracks.length}
+                                    <PlaylistMenu
+                                        compact
+                                        iconSize={14}
+                                        title="Add album to a playlist"
+                                        tracks={() =>
+                                            openTracks.map((t) => ({
+                                                title: t.title,
+                                                artist: t.artist,
+                                                album: openAlbum?.title ?? null,
+                                                duration_secs: t.duration_secs,
+                                                path: t.path,
+                                                art_path: openAlbum?.art_path ?? null,
+                                            }))}
+                                    />
+                                {/if}
                                 <button
                                     class="pill ghost"
                                     title="Show in folder"
@@ -1622,7 +1720,11 @@
                                     <span>Title</span>
                                     <span class="tdur-head"><Icon name="clock" size={13} /></span>
                                 </div>
-                                {#each openTracks as t, ti (t.id)}
+                                {#each openDiscs as d (d.disc)}
+                                    {#if multiDisc}
+                                        <div class="disc-head" in:partIn={{ delay: 40 }}>Disc {d.disc} · {d.rows.length} tracks</div>
+                                    {/if}
+                                    {#each d.rows as { t, i: ti } (t.id)}
                                     <div
                                         class="trow"
                                         class:now={isPlayingTrack(t)}
@@ -1653,6 +1755,7 @@
                                         ><Icon name="folder-open" size={13} /></button>
                                     </div>
                                     {/each}
+                                {/each}
                             {:else}
                                 <div class="tracks-loading" role="status">
                                     <div class="tl-head">No tracks found for this record</div>
@@ -1680,12 +1783,13 @@
 {#snippet gapSection(name, list)}
     {@const follow = followFor(name)}
     {#if follow}
-        {@const missing = gapRows[name]}
-        {@const total = gapTotals[name]?.total}
+        {@const key = foldKey(name)}
+        {@const missing = gapRows[key]}
+        {@const total = gapTotals[key]?.total}
         {@const count = missing ? missing.length : (total ? Math.max(0, total - list.length) : null)}
         {#if count !== 0}
             <button class="lib-gapline" onclick={() => toggleGaps(name)}>
-                {#if gapLoading[name]}
+                {#if gapLoading[key]}
                     <span class="tl-ring" aria-hidden="true"></span> Checking the catalogue
                 {:else if count != null}
                     <b>{count}</b> more released
@@ -1693,12 +1797,12 @@
                     See what's missing
                 {/if}
                 <span class="lib-gapline-cta">
-                    {gapOpen[name] ? "hide" : "show"}
-                    <Icon name={gapOpen[name] ? "chevron-down" : "chevron-right"} size={12} />
+                    {gapOpen[key] ? "hide" : "show"}
+                    <Icon name={gapOpen[key] ? "chevron-down" : "chevron-right"} size={12} />
                 </span>
             </button>
         {/if}
-        {#if gapOpen[name] && missing?.length}
+        {#if gapOpen[key] && missing?.length}
             <!-- Full-size cards, dimmed — the same card as everything else on
                  the page, readable, full strength on hover (handoff §4d). -->
             <div class="lib-gaps" role="list">
@@ -1772,7 +1876,7 @@
 
 {#snippet shelfHead(name, list)}
     {@const follow = followFor(name)}
-    {@const total = group === "artist" ? gapTotals[name]?.total : null}
+    {@const total = group === "artist" ? gapTotals[foldKey(name)]?.total : null}
     {@const secs = list.reduce((n, a) => n + a.secs, 0)}
     <!-- Every ARTIST shelf opens its page. Where no id is anchored yet the
          click resolves one first (openShelfArtist), so an unfollowed shelf is
@@ -3236,6 +3340,15 @@
     .pill:hover { background: var(--accent-hover); }
     .pill.ghost { background: var(--bg-highlight); color: var(--text-primary); }
     .pill.ghost:hover { background: var(--bg-press, #333); }
+    /* The add-to-playlist trigger wears the ghost-pill look so the CTA row
+       reads as one family; the component itself stays unstyled chrome. */
+    .rail-cta :global(.plm-trigger) {
+        background: var(--bg-highlight);
+        color: var(--text-primary);
+        padding: 6px 11px;
+        border-radius: 14px;
+    }
+    .rail-cta :global(.plm-trigger:hover) { background: var(--bg-press, #333); }
     .pill.grow { flex: 1; }
     .pill:disabled {
         background: var(--bg-highlight);
@@ -3261,6 +3374,26 @@
         color: var(--text-muted);
     }
     .tdur-head { display: flex; justify-content: flex-end; }
+    /* CatalogArtist's `.disc-head`, verbatim — a multi-disc record has to read
+       the same here as it does on the artist page. */
+    .disc-head {
+        display: flex;
+        align-items: center;
+        gap: 8px;
+        padding: 14px 10px 6px;
+        font-size: 11px;
+        font-weight: 800;
+        letter-spacing: 0.1em;
+        text-transform: uppercase;
+        color: var(--text-muted);
+    }
+    .disc-head::after {
+        content: "";
+        flex: 1;
+        height: 1px;
+        background: rgba(255, 255, 255, 0.07);
+    }
+
     .trow {
         position: relative;
         display: grid;

src/views/Playlists.svelte

@@ -1,132 +1,661 @@
 <script>
-    // The sidebar's Playlists row needs a destination. Playlists used to be
-    // listed in the sidebar itself; with the sidebar showing listening history
-    // instead, this is where they live.
-    import { playlistStore, refreshPlaylists, goToView } from "../lib/state.svelte.js";
+    // The playlist shelf: every playlist as a cover card — custom art or the
+    // composed four-cover mosaic — with pinning, duplication, export, and the
+    // two import doors (a playlist file, a pasted tracklist).
+    import {
+        playlistStore,
+        refreshPlaylists,
+        playlistCoverFor,
+        goToView,
+        playAlbum,
+    } from "../lib/state.svelte.js";
     import * as api from "../lib/api.js";
     import Icon from "./../components/Icon.svelte";
+    import PlaylistImportModal from "./../components/PlaylistImportModal.svelte";
+
+    let importOpen = $state(false);
+    let importMode = $state("file"); // "file" | "paste"
+    let importDraft = $state(null);
+    let menuFor = $state(null); // playlist id whose ⋯ menu is open
+    let confirmDelete = $state(null); // playlist id armed for deletion
+    let creating = $state(false);
+    let newMenuOpen = $state(false);
+    let probing = $state(false);
+
+    $effect(() => {
+        if (!playlistStore.loaded) refreshPlaylists();
+    });
+
+    // Covers resolve lazily through the store cache; re-render never refetches.
+    $effect(() => {
+        for (const pl of playlistStore.playlists) void playlistCoverFor(pl);
+    });
+
+    const pinned = $derived(playlistStore.playlists.filter((p) => p.pinned));
+    const rest = $derived(playlistStore.playlists.filter((p) => !p.pinned));
 
     async function newPlaylist() {
+        if (creating) return;
+        creating = true;
+        try {
             const name = `New Playlist ${playlistStore.playlists.length + 1}`;
             const id = await api.createPlaylist(name);
             await refreshPlaylists();
             goToView("playlist", { playlistId: id, label: name });
+        } finally {
+            creating = false;
+        }
+    }
+
+    async function importFromFile() {
+        newMenuOpen = false;
+        if (probing) return;
+        probing = true;
+        try {
+            const draft = await api.playlistImportProbe();
+            if (draft) {
+                importDraft = draft;
+                importMode = "file";
+                importOpen = true;
+            }
+        } catch (e) {
+            console.error("playlist import probe failed", e);
+        } finally {
+            probing = false;
+        }
+    }
+
+    async function importFromFolder() {
+        newMenuOpen = false;
+        if (probing) return;
+        probing = true;
+        try {
+            const draft = await api.playlistImportFolder();
+            if (draft) {
+                importDraft = draft;
+                importMode = "file";
+                importOpen = true;
+            }
+        } catch (e) {
+            console.error("folder import failed", e);
+        } finally {
+            probing = false;
+        }
+    }
+
+    function importFromText() {
+        newMenuOpen = false;
+        importDraft = null;
+        importMode = "paste";
+        importOpen = true;
     }
 
     function open(pl) {
         goToView("playlist", { playlistId: pl.id, label: pl.name });
     }
+
+    // Hover-play, straight from the card — the Library's own affordance.
+    // Generation-guarded: a slower fetch from an EARLIER click must not
+    // override the playlist clicked after it.
+    let playCardGen = 0;
+    async function playCard(pl) {
+        const gen = ++playCardGen;
+        const rows = await api.playlistItems(pl.id);
+        if (gen !== playCardGen) return;
+        const playable = rows.filter((r) => r.path && !r.missing);
+        if (!playable.length) {
+            open(pl); // nothing playable: the page explains why
+            return;
+        }
+        playAlbum(
+            playable.map((r) => ({
+                path: r.path,
+                title: r.title,
+                artist: r.artist,
+                album: r.album,
+                duration_secs: r.duration_secs,
+                art_path: r.art_path,
+                plItemId: r.id,
+            })),
+            pl.name,
+            0,
+        );
+    }
+
+    function toggleMenu(e, pl) {
+        e.stopPropagation();
+        confirmDelete = null;
+        menuFor = menuFor === pl.id ? null : pl.id;
+    }
+
+    async function togglePin(pl) {
+        menuFor = null;
+        await api.setPlaylistPinned(pl.id, !pl.pinned);
+        await refreshPlaylists();
+    }
+
+    async function duplicate(pl) {
+        menuFor = null;
+        const id = await api.duplicatePlaylist(pl.id, `${pl.name} copy`);
+        await refreshPlaylists();
+        goToView("playlist", { playlistId: id, label: `${pl.name} copy` });
+    }
+
+    async function exportAs(pl, format) {
+        menuFor = null;
+        try {
+            await api.playlistExport(pl.id, format);
+        } catch (e) {
+            console.error("playlist export failed", e);
+        }
+    }
+
+    async function remove(pl) {
+        if (confirmDelete !== pl.id) {
+            confirmDelete = pl.id;
+            return;
+        }
+        menuFor = null;
+        confirmDelete = null;
+        await api.deletePlaylist(pl.id);
+        await refreshPlaylists();
+    }
+
+    function onImported(id, name) {
+        importOpen = false;
+        importDraft = null;
+        refreshPlaylists();
+        goToView("playlist", { playlistId: id, label: name });
+    }
+
+    function fmtDuration(totalSecs) {
+        if (!totalSecs) return "";
+        const h = Math.floor(totalSecs / 3600);
+        const m = Math.round((totalSecs % 3600) / 60);
+        return h > 0 ? `${h} hr ${m} min` : `${m} min`;
+    }
+
+    // Close any open menu on a page click.
+    function pageClick() {
+        menuFor = null;
+        newMenuOpen = false;
+        confirmDelete = null;
+    }
 </script>
 
+<svelte:window onclick={pageClick} />
+
 <div class="page">
     <header>
+        <div class="head-text">
             <h1>Playlists</h1>
-        <button class="new" onclick={newPlaylist}>
+            {#if playlistStore.playlists.length}
+                <p class="sub">
+                    {playlistStore.playlists.length}
+                    {playlistStore.playlists.length === 1 ? "playlist" : "playlists"}
+                </p>
+            {/if}
+        </div>
+        <div class="head-actions">
+            <div class="menu-wrap">
+                <button
+                    class="btn ghost"
+                    onclick={(e) => {
+                        e.stopPropagation();
+                        menuFor = null;
+                        newMenuOpen = !newMenuOpen;
+                    }}
+                >
+                    <Icon name="download" size={15} /> Import
+                    <Icon name="chevron-down" size={13} />
+                </button>
+                {#if newMenuOpen}
+                    <div class="menu" role="menu">
+                        <button class="mi" onclick={importFromFile} disabled={probing}>
+                            <Icon name="file-text" size={15} />
+                            Playlist file…
+                            <span class="hint">M3U · XSPF · PLS · CSV · JSON</span>
+                        </button>
+                        <button class="mi" onclick={importFromFolder} disabled={probing}>
+                            <Icon name="folder-open" size={15} />
+                            Folder of audio files…
+                            <span class="hint">tag or natural order</span>
+                        </button>
+                        <button class="mi" onclick={importFromText}>
+                            <Icon name="pencil" size={15} />
+                            Paste a tracklist…
+                            <span class="hint">plain lines or timestamped setlist</span>
+                        </button>
+                    </div>
+                {/if}
+            </div>
+            <button class="btn primary" onclick={newPlaylist} disabled={creating}>
                 <Icon name="plus" size={15} /> New playlist
             </button>
+        </div>
     </header>
 
     {#if playlistStore.playlists.length === 0}
-        <p class="empty">No playlists yet.</p>
+        <div class="empty">
+            <div class="empty-icon"><Icon name="playlist" size={44} /></div>
+            <p class="empty-title">No playlists yet</p>
+            <p class="empty-sub">
+                Create one, or import an M3U/XSPF file or a pasted tracklist.
+            </p>
+        </div>
     {:else}
-        <ul>
-            {#each playlistStore.playlists as pl (pl.id)}
-                <li>
-                    <button class="row" onclick={() => open(pl)}>
-                        <span class="ic"><Icon name="playlist" size={18} /></span>
-                        <span class="name">{pl.name}</span>
-                        <span class="count">
-                            {pl.track_count}
-                            {pl.track_count === 1 ? "track" : "tracks"}
-                        </span>
-                    </button>
-                </li>
+        {#if pinned.length}
+            <div class="lab"><Icon name="pin" size={12} /> Pinned</div>
+            <div class="grid">
+                {#each pinned as pl (pl.id)}
+                    {@render card(pl)}
                 {/each}
-        </ul>
+            </div>
+            {#if rest.length}
+                <div class="lab all">All playlists</div>
+            {/if}
+        {/if}
+        <div class="grid">
+            {#each rest as pl (pl.id)}
+                {@render card(pl)}
+            {/each}
+        </div>
     {/if}
 </div>
 
+{#snippet card(pl)}
+    <div class="card-wrap">
+        <button class="card" type="button" onclick={() => open(pl)}>
+            <span class="artwrap">
+                {#if playlistStore.covers[pl.id]}
+                    <img class="art" src={playlistStore.covers[pl.id]} alt="" draggable="false" />
+                {:else}
+                    <div class="art fallback">
+                        <Icon name="playlist" size={38} />
+                    </div>
+                {/if}
+                {#if pl.track_count > pl.unresolved_count}
+                    <span
+                        class="hoverplay"
+                        role="button"
+                        tabindex="0"
+                        title="Play"
+                        onclick={(e) => {
+                            e.stopPropagation();
+                            playCard(pl);
+                        }}
+                        onkeydown={(e) => e.key === "Enter" && (e.stopPropagation(), playCard(pl))}
+                    ><Icon name="play" size={13} /></span>
+                {/if}
+            </span>
+            <div class="card-title" title={pl.name}>
+                {pl.name}
+            </div>
+            <div class="card-sub">
+                {pl.track_count} {pl.track_count === 1 ? "track" : "tracks"}
+                {#if pl.duration_secs}&thinsp;·&thinsp;{fmtDuration(pl.duration_secs)}{/if}
+            </div>
+            {#if pl.kind === "setlist" || pl.unresolved_count > 0}
+                <div class="badges">
+                    {#if pl.kind === "setlist"}<span class="badge set">Setlist</span>{/if}
+                    {#if pl.unresolved_count > 0}
+                        <span class="badge un">{pl.unresolved_count} unresolved</span>
+                    {/if}
+                </div>
+            {/if}
+        </button>
+        {#if pl.pinned}
+            <span class="pinned-mark" title="Pinned"><Icon name="pin" size={12} /></span>
+        {/if}
+        <button class="more" title="More" onclick={(e) => toggleMenu(e, pl)}>
+            <Icon name="more-horizontal" size={17} />
+        </button>
+        {#if menuFor === pl.id}
+            <!-- svelte-ignore a11y_click_events_have_key_events, a11y_no_noninteractive_element_interactions -->
+            <div class="menu card-menu" role="menu" tabindex="-1" onclick={(e) => e.stopPropagation()}>
+                <button class="mi" onclick={() => togglePin(pl)}>
+                    <Icon name="pin" size={15} /> {pl.pinned ? "Unpin" : "Pin"}
+                </button>
+                <button class="mi" onclick={() => duplicate(pl)}>
+                    <Icon name="layers" size={15} /> Duplicate
+                </button>
+                <div class="rule"></div>
+                <button class="mi" onclick={() => exportAs(pl, "m3u8")}>
+                    <Icon name="export" size={15} /> Export M3U8
+                </button>
+                <button class="mi" onclick={() => exportAs(pl, "xspf")}>
+                    <Icon name="export" size={15} /> Export XSPF
+                </button>
+                <button class="mi" onclick={() => exportAs(pl, "pls")}>
+                    <Icon name="export" size={15} /> Export PLS
+                </button>
+                <button class="mi" onclick={() => exportAs(pl, "csv")}>
+                    <Icon name="export" size={15} /> Export CSV
+                </button>
+                <button class="mi" onclick={() => exportAs(pl, "json")}>
+                    <Icon name="export" size={15} /> Export backup (JSON)
+                </button>
+                <div class="rule"></div>
+                <button class="mi danger" onclick={() => remove(pl)}>
+                    <Icon name="trash" size={15} />
+                    {confirmDelete === pl.id ? "Really delete?" : "Delete"}
+                </button>
+            </div>
+        {/if}
+    </div>
+{/snippet}
+
+<PlaylistImportModal
+    bind:open={importOpen}
+    mode={importMode}
+    draft={importDraft}
+    onimported={onImported}
+/>
+
 <style>
     .page {
         padding: 8px 4px 24px;
     }
     header {
         display: flex;
-        align-items: center;
+        align-items: flex-end;
         justify-content: space-between;
         gap: 16px;
-        margin-bottom: 18px;
+        margin-bottom: 22px;
     }
     h1 {
         font-size: 28px;
         font-weight: 700;
         letter-spacing: -0.02em;
     }
-    .new {
+    .sub {
+        margin-top: 3px;
+        font-size: 12.5px;
+        color: var(--text-muted);
+    }
+    .head-actions {
         display: flex;
         align-items: center;
+        gap: 10px;
+    }
+
+    .btn {
+        display: inline-flex;
+        align-items: center;
         gap: 7px;
-        padding: 8px 14px;
-        border-radius: 8px;
+        padding: 9px 16px;
+        border-radius: 20px;
         font-size: 13px;
-        font-weight: 600;
-        color: var(--text-secondary);
-        background: var(--bg-highlight);
+        font-weight: 700;
         transition:
             background 0.14s,
-            color 0.14s;
+            color 0.14s,
+            transform 0.14s;
     }
-    .new:hover {
+    .btn.primary {
+        background: var(--accent);
+        color: #000;
+    }
+    .btn.primary:hover:not(:disabled) {
+        background: var(--accent-hover);
+        transform: scale(1.02);
+    }
+    .btn.ghost {
+        background: var(--bg-highlight);
+        color: var(--text-secondary);
+    }
+    .btn.ghost:hover {
         background: var(--bg-press);
         color: var(--text-primary);
     }
-    ul {
-        list-style: none;
-        display: flex;
-        flex-direction: column;
-        gap: 2px;
+    .btn:disabled {
+        opacity: 0.55;
     }
-    .row {
+
+    .menu-wrap {
+        position: relative;
+    }
+    .menu {
+        position: absolute;
+        top: calc(100% + 6px);
+        right: 0;
+        min-width: 230px;
+        background: var(--bg-elevated);
+        border: 1px solid var(--border);
+        border-radius: 10px;
+        padding: 5px;
+        z-index: 40;
+        box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55);
+    }
+    .mi {
         display: flex;
         align-items: center;
-        gap: 13px;
+        gap: 10px;
         width: 100%;
-        padding: 11px 12px;
+        padding: 9px 10px;
         border-radius: 7px;
-        text-align: left;
+        font-size: 13px;
+        font-weight: 600;
         color: var(--text-secondary);
-        transition: background 0.14s;
+        text-align: left;
+        white-space: nowrap;
     }
-    .row:hover {
+    .mi:hover:not(:disabled) {
         background: var(--bg-highlight);
         color: var(--text-primary);
     }
-    .ic {
+    .mi:disabled {
+        opacity: 0.5;
+    }
+    .mi.danger:hover {
+        color: #f15e6c;
+    }
+    .mi .hint {
+        margin-left: auto;
+        font-size: 10.5px;
+        font-weight: 600;
+        color: var(--text-muted);
+        padding-left: 14px;
+    }
+    .menu .rule {
+        height: 1px;
+        background: var(--border);
+        margin: 5px 8px;
+    }
+
+    .lab {
+        display: flex;
+        align-items: center;
+        gap: 6px;
+        font-size: 11px;
+        font-weight: 700;
+        text-transform: uppercase;
+        letter-spacing: 0.08em;
+        color: var(--text-muted);
+        margin: 4px 2px 12px;
+    }
+    .lab.all {
+        margin-top: 26px;
+    }
+
+    .grid {
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(168px, 1fr));
+        gap: 16px;
+    }
+
+    .card-wrap {
+        position: relative;
+    }
+    .card {
+        display: flex;
+        flex-direction: column;
+        text-align: left;
+        background: var(--bg-elevated);
+        border-radius: var(--radius);
+        padding: 13px;
+        width: 100%;
+        height: 100%;
+        transition: background 0.2s;
+    }
+    .card:hover {
+        background: var(--bg-highlight);
+    }
+    .artwrap {
+        position: relative;
+        display: block;
+        margin-bottom: 11px;
+    }
+    .art {
+        display: block;
+        width: 100%;
+        aspect-ratio: 1;
+        object-fit: cover;
+        border-radius: 6px;
+        box-shadow: 0 8px 22px rgba(0, 0, 0, 0.35);
+    }
+    /* The Library card's own hover-play, verbatim in spirit: accent circle
+       riding the art's corner, revealed by the card hover. */
+    .hoverplay {
+        position: absolute;
+        right: 8px;
+        bottom: 8px;
+        z-index: 2;
         display: grid;
         place-items: center;
-        width: 40px;
-        height: 40px;
-        border-radius: 5px;
-        background: var(--bg-highlight);
-        color: var(--text-muted);
-        flex: none;
+        width: 34px;
+        height: 34px;
+        border-radius: 50%;
+        background: var(--accent);
+        color: #000;
+        box-shadow: 0 8px 18px rgba(0, 0, 0, 0.5);
+        opacity: 0;
+        transform: translateY(4px);
+        transition:
+            opacity 0.18s ease,
+            transform 0.18s ease,
+            background 0.18s ease;
     }
-    .name {
-        flex: 1;
-        min-width: 0;
-        font-size: 14px;
+    .hoverplay:hover {
+        background: var(--accent-hover);
+    }
+    .card-wrap:hover .hoverplay,
+    .hoverplay:focus-visible {
+        opacity: 1;
+        transform: none;
+    }
+    .art.fallback {
+        display: grid;
+        place-items: center;
+        background: linear-gradient(135deg, var(--accent-soft), var(--bg-press) 72%);
+        color: var(--text-secondary);
+    }
+    .card-title {
         font-weight: 600;
+        font-size: 14px;
+        line-height: 1.3;
+        overflow: hidden;
+        display: -webkit-box;
+        -webkit-box-orient: vertical;
+        -webkit-line-clamp: 2;
+    }
+    .card-sub {
+        font-size: 12px;
+        color: var(--text-secondary);
+        margin-top: 3px;
         white-space: nowrap;
         overflow: hidden;
         text-overflow: ellipsis;
     }
-    .count {
-        font-size: 12px;
-        color: var(--text-muted);
-        flex: none;
+    .badges {
+        display: flex;
+        gap: 5px;
+        margin-top: 7px;
+        flex-wrap: wrap;
     }
+    .badge {
+        font-size: 10px;
+        font-weight: 700;
+        letter-spacing: 0.04em;
+        padding: 2.5px 7px;
+        border-radius: 8px;
+    }
+    .badge.set {
+        background: var(--accent-soft);
+        color: var(--accent-hover);
+    }
+    .badge.un {
+        background: rgba(232, 163, 61, 0.15);
+        color: #e8a33d;
+    }
+
+    .pinned-mark {
+        position: absolute;
+        top: 20px;
+        left: 20px;
+        display: grid;
+        place-items: center;
+        width: 22px;
+        height: 22px;
+        border-radius: 50%;
+        background: rgba(0, 0, 0, 0.55);
+        color: #fff;
+        backdrop-filter: blur(6px);
+        pointer-events: none;
+    }
+    .more {
+        position: absolute;
+        top: 20px;
+        right: 20px;
+        display: grid;
+        place-items: center;
+        width: 27px;
+        height: 27px;
+        border-radius: 50%;
+        color: #fff;
+        background: rgba(0, 0, 0, 0.45);
+        opacity: 0;
+        transition:
+            opacity 0.15s,
+            background 0.15s;
+    }
+    .card-wrap:hover .more,
+    .more:focus-visible {
+        opacity: 1;
+    }
+    .more:hover {
+        background: rgba(0, 0, 0, 0.7);
+    }
+    .card-menu {
+        top: 48px;
+        right: 14px;
+    }
+
     .empty {
+        display: flex;
+        flex-direction: column;
+        align-items: center;
+        padding-top: 14vh;
+        text-align: center;
+    }
+    .empty-icon {
+        display: grid;
+        place-items: center;
+        width: 92px;
+        height: 92px;
+        border-radius: 24px;
+        background: var(--bg-elevated);
         color: var(--text-muted);
+        margin-bottom: 18px;
+    }
+    .empty-title {
+        font-size: 17px;
+        font-weight: 700;
+    }
+    .empty-sub {
+        margin-top: 5px;
         font-size: 13px;
+        color: var(--text-muted);
+        max-width: 380px;
     }
 </style>

tests/lyrics/sync.test.mjs

@@ -0,0 +1,76 @@
+// Rough-sync generator invariants: segmentation hysteresis, weighted
+// distribution inside measured segments only, and the refusal floor (no
+// evidence → no guess — the research doc forbids naive even-spread).
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import {
+    activeSegments,
+    lyricLinesOf,
+    distributeLines,
+    roughSync,
+} from "../../src/lib/lyric-sync.js";
+
+const FRAME = 100;
+const quiet = (n) => Array(n).fill(0.05);
+const loud = (n) => Array(n).fill(0.8);
+
+test("segments form around sustained activity with hysteresis", () => {
+    // 3s quiet, 5s loud, 3s quiet, 4s loud, 2s quiet.
+    const frames = [...quiet(30), ...loud(50), ...quiet(30), ...loud(40), ...quiet(20)];
+    const segs = activeSegments(frames, FRAME);
+    assert.equal(segs.length, 2);
+    assert.equal(segs[0].startMs, 3000);
+    assert.ok(Math.abs(segs[0].endMs - 8000) <= 1000, `end near 8s, got ${segs[0].endMs}`);
+    assert.equal(segs[1].startMs, 11000);
+});
+
+test("a single hot frame is not singing, a short dip is not a break", () => {
+    const blip = [...quiet(20), 0.9, ...quiet(30)];
+    assert.equal(activeSegments(blip, FRAME).length, 0, "blip ignored (min length)");
+
+    // 4s loud, 0.4s dip, 4s loud → ONE segment (dip shorter than offRun).
+    const dip = [...loud(40), ...quiet(4), ...loud(40)];
+    assert.equal(activeSegments(dip, FRAME).length, 1);
+});
+
+test("section labels are dropped from the timing lines", () => {
+    const lines = lyricLinesOf("[Verse 1]\nFirst line\n\nSecond line\n[Chorus]\nThird");
+    assert.deepEqual(lines, ["First line", "Second line", "Third"]);
+});
+
+test("lines land inside segments, in order, weighted by length", () => {
+    const segments = [
+        { startMs: 5000, endMs: 15000 },
+        { startMs: 30000, endMs: 40000 },
+    ];
+    const lines = ["Short", "A much much much longer line of lyric text", "Mid line here", "End"];
+    const out = distributeLines(lines, segments);
+    assert.equal(out.length, 4);
+    assert.equal(out[0].time_ms, 5000, "first line starts at the first vocal onset");
+    for (let i = 1; i < out.length; i++) {
+        assert.ok(out[i].time_ms > out[i - 1].time_ms, "monotonic");
+    }
+    for (const line of out) {
+        const inside = segments.some((s) => line.time_ms >= s.startMs && line.time_ms <= s.endMs);
+        assert.ok(inside, `${line.time_ms} must sit inside a vocal segment`);
+    }
+    // The long second line pushes line 3 further than an even split would.
+    const even = 5000 + (2 / 4) * 20000;
+    assert.ok(out[2].time_ms > even - 2000);
+});
+
+test("no usable activity → refusal, never an even spread", () => {
+    assert.equal(roughSync("One\nTwo\nThree", quiet(600), FRAME), null);
+    assert.equal(roughSync("One\nTwo", [], FRAME), null);
+    assert.equal(distributeLines([], [{ startMs: 0, endMs: 9000 }]), null);
+});
+
+test("end to end over a synthetic song", () => {
+    // intro 8s quiet — verse 20s — break 6s — chorus 20s.
+    const frames = [...quiet(80), ...loud(200), ...quiet(60), ...loud(200)];
+    const text = "Line one\nLine two\nLine three\nLine four\nLine five\nLine six";
+    const out = roughSync(text, frames, FRAME);
+    assert.equal(out.length, 6);
+    assert.equal(out[0].time_ms, 8000, "starts at the verse, not at 0:00");
+    assert.ok(out[5].time_ms >= 34000, "later lines reach the chorus");
+});