fix(now-playing): split artist links and About the Artist tabs (#960)

* fix(now-playing): split artist links and About the Artist tabs

OpenSubsonic artists[] now drives per-artist navigation on Now Playing
hero and the queue current-track row (matching player bar). About the
Artist loads bio for each performer via tabs when a track has multiple
artist ids; queue Info uses the primary ref for bio/tour fetch.

Reported by zunoz on the Psysonic Discord (v1.47.0-rc.3).

* docs: note Now Playing multi-artist fix in CHANGELOG (PR #960)

src/utils/playback/trackArtistRefs.ts

@@ -0,0 +1,21 @@
+import type { SubsonicOpenArtistRef } from '../../api/subsonicTypes';
+import type { Track } from '../../store/playerStoreTypes';
+
+type TrackArtistFields = Pick<Track, 'artist' | 'artistId' | 'artists'>;
+
+/** OpenSubsonic `artists` when present; else legacy `artistId` + `artist` (album track rows). */
+export function resolveTrackArtistRefs(track: TrackArtistFields): SubsonicOpenArtistRef[] {
+  if (track.artists && track.artists.length > 0) {
+    return track.artists;
+  }
+  const id = track.artistId?.trim();
+  if (id) {
+    return [{ id, name: track.artist }];
+  }
+  return [{ name: track.artist }];
+}
+
+/** First performer ref — used for artist bio / discography / top songs on Now Playing. */
+export function primaryTrackArtistRef(track: TrackArtistFields): SubsonicOpenArtistRef {
+  return resolveTrackArtistRefs(track)[0];
+}