feat(metadata): show explicit badges in track titles

test/download_history_logic_test.dart

@@ -114,6 +114,16 @@ void main() {
       expect(restored.format, 'flac');
     });
 
+    test('explicit metadata survives history serialization', () {
+      final item = _historyItem(
+        id: 'explicit',
+        filePath: '/music/Album/Explicit Song.flac',
+        downloadedAt: DateTime.utc(2026, 7, 23),
+      ).copyWith(explicit: true);
+
+      expect(DownloadHistoryItem.fromJson(item.toJson()).explicit, isTrue);
+    });
+
     test('placeholder refresh cannot erase an existing measured quality', () {
       expect(
         resolvePersistedHistoryQuality(

test/models_and_utils_test.dart

@@ -128,6 +128,7 @@ void main() {
         scannedAt: DateTime(2026),
         bitDepth: 24,
         sampleRate: 96000,
+        explicit: true,
       );
 
       final updated = item.withAudioMetadata(bitrate: 1840);
@@ -135,6 +136,7 @@ void main() {
       expect(updated.bitrate, 1840);
       expect(updated.bitDepth, 24);
       expect(updated.sampleRate, 96000);
+      expect(updated.explicit, isTrue);
       expect(updated.trackName, 'Song');
       expect(updated.filePath, '/music/song.flac');
       expect(updated.sourceId, 'external-ssd');
@@ -142,6 +144,7 @@ void main() {
         LocalLibraryItem.fromJson(updated.toJson()).sourceId,
         'external-ssd',
       );
+      expect(LocalLibraryItem.fromJson(updated.toJson()).explicit, isTrue);
     });
 
     test('recognizes a retained external source index', () {

test/music_player_media_metadata_test.dart

@@ -11,6 +11,7 @@ void main() {
     sampleRate: 96000,
     bitrate: 2860,
     format: 'flac',
+    explicit: true,
   );
 
   test('queue media exposes technical quality to Now Playing immediately', () {
@@ -21,6 +22,7 @@ void main() {
       'sample_rate': 96000,
       'bitrate': 2860,
       'format': 'flac',
+      'explicit': true,
     });
   });
 
@@ -32,6 +34,7 @@ void main() {
     expect(restored.sampleRate, 96000);
     expect(restored.bitrate, 2860);
     expect(restored.format, 'flac');
+    expect(restored.explicit, isTrue);
   });
 
   test('file probe cannot erase valid queue quality with empty values', () {

test/track_metadata_header_contrast_test.dart

@@ -5,6 +5,7 @@ import 'package:spotiflac_android/l10n/l10n.dart';
 import 'package:spotiflac_android/providers/download_history_provider.dart';
 import 'package:spotiflac_android/screens/track_metadata_screen.dart';
 import 'package:spotiflac_android/widgets/album_detail_header.dart';
+import 'package:spotiflac_android/widgets/audio_quality_badges.dart';
 
 void main() {
   testWidgets('metadata hero keeps technical text legible in light theme', (
@@ -25,6 +26,7 @@ void main() {
       bitDepth: 16,
       sampleRate: 44100,
       format: 'flac',
+      explicit: true,
     );
 
     await tester.pumpWidget(
@@ -41,6 +43,7 @@ void main() {
 
     final headerMeta = find.byType(HeaderMetaRow);
     expect(headerMeta, findsOneWidget);
+    expect(find.byType(ExplicitBadge), findsNWidgets(2));
     for (final label in const ['16-bit/44.1kHz', '4:10', 'Tidal-web']) {
       final text = tester.widget<Text>(
         find.descendant(of: headerMeta, matching: find.text(label)),