feat(library): add Mornye browsing and contextual compact navigation

Add category browsing, a two-column Recently Added grid, and a dedicated download queue. Keep compact navigation icons and their animations aligned with the active tab.

Keep profile avatars circular and report lyric enrichment outcomes accurately, preserving existing lyrics and supporting instrumental markers.

lib/services/library_database.dart

@@ -1604,6 +1604,55 @@ class LibraryDatabase {
     );
   }
 
+  /// Album artists across downloaded and scanned music, without loading tracks
+  /// into Dart. Scanned paths already represented by downloads are excluded.
+  Future<List<Map<String, dynamic>>> getQueueArtistPage(
+    QueueLibraryDbQuery request,
+  ) async {
+    final db = await database;
+    await _ensureHistoryAttached(db);
+    final parts = <String>[
+      '''
+        SELECT sort_album_artist AS artist_key,
+          COALESCE(NULLIF(album_artist, ''), artist_name) AS artist_name,
+          cover_url, NULL AS cover_path, file_path AS sample_file_path
+        FROM history_db.history
+      ''',
+      if (request.includeLocal)
+        '''
+          SELECT album_artist_norm AS artist_key,
+            COALESCE(NULLIF(album_artist, ''), artist_name) AS artist_name,
+            NULL AS cover_url, cover_path, file_path AS sample_file_path
+          FROM $visibleLibraryView l
+          WHERE NOT EXISTS (
+            SELECT 1 FROM library_path_keys lpk
+            JOIN history_db.history_path_keys hpk ON hpk.path_key = lpk.path_key
+            WHERE lpk.item_id = l.id
+          )
+        ''',
+    ];
+    final search = normalizeLookupText(request.searchQuery);
+    return db.rawQuery(
+      '''
+      SELECT artist_key, MIN(artist_name) AS artist_name,
+        MAX(NULLIF(cover_url, '')) AS cover_url,
+        MAX(NULLIF(cover_path, '')) AS cover_path,
+        MAX(sample_file_path) AS sample_file_path,
+        COUNT(*) AS track_count
+      FROM (${parts.join(' UNION ALL ')})
+      WHERE artist_key != '' ${search.isEmpty ? '' : "AND artist_key LIKE ? ESCAPE '\\'"}
+      GROUP BY artist_key
+      ORDER BY artist_key
+      LIMIT ? OFFSET ?
+    ''',
+      [
+        if (search.isNotEmpty) '%${_escapeLikePattern(search)}%',
+        request.limit,
+        request.offset,
+      ],
+    );
+  }
+
   Future<List<Map<String, dynamic>>> getQueueLocalAlbumTracks(
     String albumName,
     String artistName,