fix(metadata): preserve the selected recording during download enrichment

lib/services/download_track_metadata.dart

@@ -1,6 +1,7 @@
 import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/int_utils.dart';
+import 'package:spotiflac_android/utils/isrc_utils.dart';
 import 'package:spotiflac_android/utils/logger.dart';
 import 'package:spotiflac_android/utils/string_utils.dart';
 
@@ -26,18 +27,32 @@ Future<Track> enrichIncompleteDownloadTrack(
     final data = response['track'];
     if (data is! Map<String, dynamic>) return track;
     String? text(String key) => normalizeOptionalString(data[key]?.toString());
+    final selectedIsrc = normalizeIsrc(track.isrc);
+    final resolvedIsrc = normalizeIsrc(text('isrc'));
+    if (selectedIsrc.isNotEmpty &&
+        resolvedIsrc.isNotEmpty &&
+        selectedIsrc != resolvedIsrc) {
+      AppLogger(
+        'DownloadMetadata',
+      ).w('Ignoring supplemental metadata for a different recording');
+      return track;
+    }
     final durationMs = readPositiveInt(data['duration_ms']);
     return track.copyWith(
-      id: text('spotify_id') ?? track.id,
-      name: text('name') ?? track.name,
-      artistName: text('artists') ?? track.artistName,
+      // This lookup fills missing credits; the selected track still determines
+      // which recording is downloaded and named (including remix qualifiers).
+      name: normalizeOptionalString(track.name) ?? text('name') ?? track.name,
+      artistName:
+          normalizeOptionalString(track.artistName) ??
+          text('artists') ??
+          track.artistName,
       albumName: text('album_name') ?? track.albumName,
       albumArtist: text('album_artist') ?? track.albumArtist,
       artistId: text('artist_id') ?? text('artistId') ?? track.artistId,
       albumId: text('album_id') ?? track.albumId,
       coverUrl: text('images') ?? track.coverUrl,
       duration: durationMs == null ? track.duration : durationMs ~/ 1000,
-      isrc: text('isrc') ?? track.isrc,
+      isrc: normalizeOptionalString(track.isrc) ?? text('isrc'),
       trackNumber: readPositiveInt(data['track_number']) ?? track.trackNumber,
       discNumber: readPositiveInt(data['disc_number']) ?? track.discNumber,
       totalDiscs: readPositiveInt(data['total_discs']) ?? track.totalDiscs,