fix: include full track metadata in GetAudioFilesByReleaseGroup query

The GetAudioFilesByReleaseGroup SQL query only selected 6 columns,
missing audio properties (sample_rate, bit_depth, channels, bitrate,
file_size) and metadata (album, genre, year, composer, file_type).
This caused track details opened from the album view to show dashes
instead of actual values. Expanded the query to match
GetAllTracksWithFullMetadata and updated GetAlbumTracks to use the
shared mapTrackRow helper.

backend/database/sql/queries/audio_files.sql

@@ -137,10 +137,28 @@ SELECT
     COALESCE(r.name, '') AS title,
     COALESCE(ac.text, '') AS artist_name,
     rgr.track_number,
-    rgr.disc_number
+    rgr.disc_number,
+    COALESCE(rg.name, '') AS album,
+    CAST(COALESCE(
+        (SELECT GROUP_CONCAT(g.name, '||')
+         FROM recording_genres rg_sub
+         JOIN genres g ON rg_sub.genre_id = g.id
+         WHERE rg_sub.recording_id = r.id),
+        ''
+    ) AS TEXT) AS genre,
+    COALESCE(r.year, 0) AS year,
+    COALESCE(r.composer, '') AS composer,
+    COALESCE(ft.extension, '') AS file_type,
+    af.sample_rate,
+    af.bit_depth,
+    af.channels,
+    af.bitrate,
+    af.file_size
 FROM release_group_recordings rgr
 JOIN recordings r ON rgr.recording_id = r.id
 JOIN audio_files af ON af.recording_id = r.id
 LEFT JOIN artist_credit ac ON r.artist_credit_id = ac.id
+LEFT JOIN release_groups rg ON rgr.release_group_id = rg.id
+LEFT JOIN file_types ft ON af.file_type_id = ft.id
 WHERE rgr.release_group_id = ?
 ORDER BY rgr.disc_number, rgr.track_number;