fix(ui): split album and track artists (OpenSubsonic) (#696)

* fix(ui): split OpenSubsonic album and track artists in header and player

Album detail header uses albumArtists from album or child songs; player bar,
mobile player, and mini player use structured track artists with per-id links.
Adds deriveAlbumHeaderArtistRefs helper and OpenArtistRefInline.

Fixes #552

* docs: changelog and credits for OpenSubsonic artist links (PR #696)

src/utils/playback/songToTrack.test.ts

@@ -85,6 +85,14 @@ describe('songToTrack', () => {
     expect(t.replayGainPeak).toBeUndefined();
   });
 
+  it('copies OpenSubsonic artists when present', () => {
+    const song = makeSubsonicSong({
+      artists: [{ id: 'a1', name: 'Feat' }, { id: 'a2', name: 'Main' }],
+    });
+    const t = songToTrack(song);
+    expect(t.artists).toEqual(song.artists);
+  });
+
   it('does not invent fields that the Subsonic song lacks', () => {
     const song = makeSubsonicSong({});
     const t = songToTrack(song);
@@ -92,5 +100,6 @@ describe('songToTrack', () => {
     expect(t.autoAdded).toBeUndefined();
     expect(t.radioAdded).toBeUndefined();
     expect(t.playNextAdded).toBeUndefined();
+    expect(t.artists).toBeUndefined();
   });
 });

src/utils/playback/songToTrack.ts

@@ -8,6 +8,7 @@ export function songToTrack(song: SubsonicSong): Track {
     album: song.album,
     albumId: song.albumId,
     artistId: song.artistId,
+    artists: song.artists && song.artists.length > 0 ? song.artists : undefined,
     duration: song.duration,
     coverArt: song.coverArt,
     track: song.track,