metadata: per-track listeners, and an artist profile the search hero can ask for

CatalogTrack gains artist_id — Deezer sends it on every search row and it was
simply unparsed — and rank, its 0-1,000,000 popularity figure. Together they
let a listener count be resolved for the PERFORMING artist of each row rather
than for the query's top artist, so a "panda bear" search shows Daft Punk's
"Doin' it Right (feat. Panda Bear)" at its real 464,046.

Resolution rides the existing deezer_linked_mbid -> lastfm_listener_ranks chain
behind a new catalog_track_listeners command, deliberately kept separate from
catalog_search: that one is typed against per keystroke and must never wait on
MusicBrainz's 1 req/s gate.

catalog_artist_profile backs the hero's middle third — MusicBrainz tags off the
cached artist document plus one Last.fm artist.getinfo.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src-tauri/src/lib.rs

@@ -59,6 +59,7 @@ pub fn run() {
             commands::play_local,
             commands::preload_local,
             commands::player_control,
+            commands::player_state,
             commands::waveform,
             commands::library_albums,
             commands::album_tracks,
@@ -100,6 +101,8 @@ pub fn run() {
             commands::pick_artist_hero,
             commands::clear_artist_hero,
             commands::catalog_related,
+            commands::catalog_track_listeners,
+            commands::catalog_artist_profile,
             commands::catalog_album,
             commands::catalog_album_info,
             commands::catalog_art,