fix: album track wrapping + try multiple Song() call patterns for tracks

- Album: wrap item.get('track') as {itemV2: ...} so _parse_track navigates trackUnion correctly
- Track: try get_song_info(url) then get_song_info(); log Song/Public methods on failure

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/spotify_resolve.py

@@ -64,10 +64,26 @@ def resolve(sp_type, sp_id):
     url = f'https://open.spotify.com/{sp_type}/{sp_id}'
 
     if sp_type == 'track':
-        # Song requires a client instance as first arg; Public() is the unauthenticated client
-        public = sp_mod.Public()
-        song = sp_mod.Song(public, url)
-        raw  = song.get_song_info()
+        # Song(url) stores url as the client object, then get_song_info() or init
+        # tries to call url.login which fails. Try: Song(url) + get_song_info(url),
+        # then Song(url) + get_song_info(), log methods as last resort.
+        song = sp_mod.Song(url)
+        song_methods = [m for m in dir(song) if not m.startswith('_')]
+        eprint(f'[spotapi] Song methods: {song_methods}')
+        raw = None
+        for attempt in [
+            lambda: song.get_song_info(url),
+            lambda: song.get_song_info(),
+        ]:
+            try:
+                raw = attempt()
+                break
+            except Exception as e:
+                eprint(f'[spotapi] track attempt failed: {type(e).__name__}: {e}')
+        if raw is None:
+            pub = sp_mod.Public()
+            eprint(f'[spotapi] Public methods: {[m for m in dir(pub) if not m.startswith("_")]}')
+            raise Exception('Song resolution: all attempts failed')
         eprint(f'[spotapi] track raw type={type(raw).__name__} keys={list(raw.keys()) if isinstance(raw, dict) else "?"}')
         if isinstance(raw, dict):
             for k, v in raw.items():
@@ -113,10 +129,11 @@ def resolve(sp_type, sp_id):
         art = cover_items[0].get('url', '') if cover_items else ''
         # tracks
         raw_tracks = (au.get('tracks') or {}).get('items') or []
-        # album track items look like {uid, track: {data: {trackUnion: {...}}}}
+        # album track items: {uid, track: {__typename, data: {trackUnion: {...}}}}
+        # wrap as {itemV2: track_obj} so _parse_track can navigate itemV2.data.trackUnion
         def _alb_track(item):
-            inner = item.get('track') or item
-            return _parse_track(inner,
+            track_obj = item.get('track') or item
+            return _parse_track({'itemV2': track_obj},
                 default_album=name, default_art=art,
                 default_artist=artist)
         tracks = [t for t in (_alb_track(i) for i in raw_tracks) if t]