fix: use album-level artist for Various Artists albums instead of first track's artist

- Extension: fix extractSchemaOrg to find album-level schema (with numTracks) instead of per-track schema
- Extension: add secondaryText2 fallback in parseDescriptiveRows for VA album track artists
- Extension: use headerPrimaryText as primary album artist source, overriding schema.org
- App: album_screen now uses widget.artistName (album-level) instead of tracks.first.artistName
- App: home_tab _parseTrack now populates albumArtist from track data or album-level artist
- Bump Amazon extension to v2.0.1

lib/screens/album_screen.dart

@@ -95,7 +95,7 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
           .recordAlbumAccess(
             id: widget.albumId,
             name: widget.albumName,
-            artistName: widget.tracks?.firstOrNull?.artistName,
+            artistName: widget.artistName ?? widget.tracks?.firstOrNull?.albumArtist ?? widget.tracks?.firstOrNull?.artistName,
             imageUrl: widget.coverUrl,
             providerId: providerId,
           );
@@ -283,7 +283,10 @@ class _AlbumScreenState extends ConsumerState<AlbumScreen> {
   ) {
     final expandedHeight = _calculateExpandedHeight(context);
     final tracks = _tracks ?? [];
-    final artistName = tracks.isNotEmpty ? tracks.first.artistName : null;
+    final artistName = widget.artistName ??
+        (tracks.isNotEmpty
+            ? (tracks.first.albumArtist ?? tracks.first.artistName)
+            : null);
     final releaseDate = tracks.isNotEmpty ? tracks.first.releaseDate : null;
 
     return SliverAppBar(

lib/screens/home_tab.dart

@@ -3909,6 +3909,7 @@ class _ExtensionAlbumScreenState extends ConsumerState<ExtensionAlbumScreen> {
       name: (data['name'] ?? '').toString(),
       artistName: (data['artists'] ?? data['artist'] ?? '').toString(),
       albumName: (data['album_name'] ?? widget.albumName).toString(),
+      albumArtist: (data['album_artist'] ?? _artistName)?.toString(),
       artistId:
           (data['artist_id'] ?? data['artistId'])?.toString() ?? _artistId,
       albumId: data['album_id']?.toString() ?? widget.albumId,