feat: quality picker with track info, update dialog redesign, finalizing notification fix

- Quality picker now shows track name, artist, and cover
- Tap to expand long track titles (icon only shows when truncated)
- Ripple effect follows rounded corners including drag handle
- Update dialog redesigned with Material Expressive 3 style
- Fixed update notification stuck at 100% after download complete
- Ask before download now enabled by default
- Finalizing notification for multi-progress polling

lib/models/download_item.dart

@@ -7,6 +7,7 @@ part 'download_item.g.dart';
 enum DownloadStatus {
   queued,
   downloading,
+  finalizing, // Embedding metadata, cover, lyrics
   completed,
   failed,
   skipped,

lib/models/download_item.g.dart

@@ -36,6 +36,7 @@ Map<String, dynamic> _$DownloadItemToJson(DownloadItem instance) =>
 const _$DownloadStatusEnumMap = {
   DownloadStatus.queued: 'queued',
   DownloadStatus.downloading: 'downloading',
+  DownloadStatus.finalizing: 'finalizing',
   DownloadStatus.completed: 'completed',
   DownloadStatus.failed: 'failed',
   DownloadStatus.skipped: 'skipped',

lib/models/settings.dart

@@ -35,7 +35,7 @@ class AppSettings {
     this.folderOrganization = 'none', // Default: no folder organization
     this.convertLyricsToRomaji = false, // Default: keep original Japanese
     this.historyViewMode = 'grid', // Default: grid view
-    this.askQualityBeforeDownload = false, // Default: use preset quality
+    this.askQualityBeforeDownload = true, // Default: ask quality before download
   });
 
   AppSettings copyWith({

lib/models/settings.g.dart

@@ -21,7 +21,7 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
   folderOrganization: json['folderOrganization'] as String? ?? 'none',
   convertLyricsToRomaji: json['convertLyricsToRomaji'] as bool? ?? false,
   historyViewMode: json['historyViewMode'] as String? ?? 'grid',
-  askQualityBeforeDownload: json['askQualityBeforeDownload'] as bool? ?? false,
+  askQualityBeforeDownload: json['askQualityBeforeDownload'] as bool? ?? true,
 );
 
 Map<String, dynamic> _$AppSettingsToJson(AppSettings instance) =>