feat(library): add lyrics filtering and metadata actions

lib/widgets/downloadable_cover.dart

@@ -0,0 +1,115 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:spotiflac_android/l10n/l10n.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/services/cover_download_service.dart';
+import 'package:spotiflac_android/utils/string_utils.dart';
+
+/// Adds the app-wide long-press-to-save behavior to a remote cover image.
+///
+/// The child keeps its normal tap behavior. Only the long-press gesture is
+/// claimed here, so a surrounding track or collection card can still open its
+/// usual options when the user presses outside the artwork.
+class DownloadableCover extends ConsumerStatefulWidget {
+  final String? coverUrl;
+  final String baseName;
+  final Widget child;
+  final bool enabled;
+
+  const DownloadableCover({
+    super.key,
+    required this.coverUrl,
+    required this.baseName,
+    required this.child,
+    this.enabled = true,
+  });
+
+  @override
+  ConsumerState<DownloadableCover> createState() => _DownloadableCoverState();
+}
+
+class _DownloadableCoverState extends ConsumerState<DownloadableCover> {
+  bool _saving = false;
+
+  String get _coverUrl => normalizeRemoteHttpUrl(widget.coverUrl) ?? '';
+
+  Future<void> _saveCover() async {
+    if (_saving) return;
+    final coverUrl = _coverUrl;
+    if (coverUrl.isEmpty) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(context.l10n.trackCoverNoSource)));
+      return;
+    }
+
+    setState(() => _saving = true);
+    ScaffoldMessenger.of(context)
+      ..hideCurrentSnackBar()
+      ..showSnackBar(SnackBar(content: Text(context.l10n.updateDownloading)));
+
+    try {
+      final saved = await CoverDownloadService.saveRemoteCover(
+        coverUrl: coverUrl,
+        baseName: widget.baseName,
+        settings: ref.read(settingsProvider),
+      );
+      if (!mounted) return;
+      ScaffoldMessenger.of(context)
+        ..hideCurrentSnackBar()
+        ..showSnackBar(
+          SnackBar(content: Text(context.l10n.trackCoverSaved(saved.fileName))),
+        );
+    } catch (error) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context)
+        ..hideCurrentSnackBar()
+        ..showSnackBar(
+          SnackBar(
+            content: Text(
+              context.l10n.trackSaveFailed(context.friendlyError(error)),
+            ),
+          ),
+        );
+    } finally {
+      if (mounted) setState(() => _saving = false);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final canSave = widget.enabled && _coverUrl.isNotEmpty;
+    final semanticLabel =
+        '${context.l10n.dialogDownload} '
+        '${context.l10n.editMetadataFieldCover}: ${widget.baseName}';
+
+    return Semantics(
+      button: canSave,
+      label: semanticLabel,
+      onLongPress: canSave ? _saveCover : null,
+      child: GestureDetector(
+        behavior: HitTestBehavior.opaque,
+        excludeFromSemantics: true,
+        onLongPress: canSave ? _saveCover : null,
+        child: Stack(
+          fit: StackFit.passthrough,
+          children: [
+            widget.child,
+            if (_saving)
+              const Positioned.fill(
+                child: ColoredBox(
+                  color: Color(0x33000000),
+                  child: Center(
+                    child: SizedBox.square(
+                      dimension: 22,
+                      child: CircularProgressIndicator(strokeWidth: 2),
+                    ),
+                  ),
+                ),
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/widgets/track_collection_quick_actions.dart

@@ -1,5 +1,6 @@
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:spotiflac_android/widgets/app_bottom_sheet.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
@@ -194,6 +195,23 @@ class _TrackOptionsSheet extends ConsumerWidget {
                   onTap: () => _downloadQualityVariant(context, ref),
                 ),
 
+              _OptionTile(
+                icon: Icons.content_copy_rounded,
+                title: context.l10n.trackOptionCopyTrackName,
+                onTap: () => _copyText(context, track.name),
+              ),
+              _OptionTile(
+                icon: Icons.person_outline_rounded,
+                title: context.l10n.trackOptionCopyArtist,
+                onTap: () => _copyText(context, track.artistName),
+              ),
+              _OptionTile(
+                icon: Icons.copy_all_rounded,
+                title: context.l10n.trackOptionCopyTrackAndArtist,
+                onTap: () =>
+                    _copyText(context, '${track.name} - ${track.artistName}'),
+              ),
+
               _OptionTile(
                 icon: Icons.album_outlined,
                 title: context.l10n.homeGoToAlbum,
@@ -275,6 +293,15 @@ class _TrackOptionsSheet extends ConsumerWidget {
     downloadSingleTrack(rootContext, ref, track, forceQualityPicker: true);
   }
 
+  void _copyText(BuildContext context, String text) {
+    final rootContext = Navigator.of(context, rootNavigator: true).context;
+    Navigator.pop(context);
+    Clipboard.setData(ClipboardData(text: text));
+    ScaffoldMessenger.of(rootContext).showSnackBar(
+      SnackBar(content: Text(rootContext.l10n.trackCopiedToClipboard)),
+    );
+  }
+
   Future<void> _goToAlbum(BuildContext context) async {
     final navigationContext = Navigator.of(
       context,