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/api/subsonicTypes.ts

@@ -20,6 +20,8 @@ export interface SubsonicAlbum {
   isCompilation?: boolean;
   /** OpenSubsonic: release types from MusicBrainz tags (e.g. "Album", "EP", "Single", "Compilation", "Live"). */
   releaseTypes?: string[];
+  /** OpenSubsonic: album-level credits (Navidrome may attach on album and/or child songs). */
+  albumArtists?: SubsonicOpenArtistRef[];
 }
 
 /** OpenSubsonic `artists` / `albumArtists` entries on a child song (may include `userRating`). */