Feed collab mode album-level artists instead of per-track artists so
$albumartist and the album_artist tag are consistent across all tracks
in an album. Fixes media servers (Navidrome/Jellyfin/Plex) showing one
album split under multiple artist names (e.g. KPOP Demon Hunters).
- _build_final_path_for_track: resolve $albumartist from explicit batch
context or spotify_album.artists, pass album-level _artists_list to
collab mode instead of per-track artists
- _extract_spotify_metadata: same album-level artists for album_artist
tag collab resolution
- Wishlist path: pre-compute per-album artist map so all tracks from
the same album get the same artist context
- Download worker: propagate album artists array in spotify_album_context
30d5f76e3d
