Baseline: full tree snapshot after git repository loss

The previous .git directory was found gutted (only info/ remained), so
history is unrecoverable locally. This commit restores version control
with the tree exactly as it stands: the working app, the preview-tracks
launcher on the artist hero, the scrollable-track-previews design bundle
(docs + approved mockups), and the Phase 0 validation artifacts.

crates/player/examples/play.rs

@@ -0,0 +1,41 @@
+//! Local playback smoke test: play a file, seek, report positions.
+//!
+//!   cargo run -p player --example play -- "C:\path\to\file.flac"
+
+use player::{Player, PlayerEvent};
+use std::time::Duration;
+
+fn main() {
+    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("debug")).init();
+    let path = std::env::args().nth(1).expect("usage: play <file>");
+
+    let (player, events) = Player::spawn();
+    player.play_local(&path, None);
+
+    let mut last_pos = 0.0;
+    let start = std::time::Instant::now();
+    let mut seeked = false;
+
+    while start.elapsed() < Duration::from_secs(12) {
+        match events.recv_timeout(Duration::from_millis(500)) {
+            Ok(PlayerEvent::Playing) => println!("PLAYING"),
+            Ok(PlayerEvent::Position { secs, duration }) => {
+                last_pos = secs;
+                println!("pos={secs:.1} dur={duration:?}");
+                if secs > 3.0 && !seeked {
+                    seeked = true;
+                    println!("SEEK to 60s…");
+                    player.seek(60.0);
+                }
+            }
+            Ok(PlayerEvent::Error(e)) => {
+                println!("ERROR: {e}");
+                return;
+            }
+            Ok(ev) => println!("{ev:?}"),
+            Err(_) => {}
+        }
+    }
+    println!("final pos: {last_pos:.1} (expect > 60 if seek worked)");
+    player.stop();
+}