feat(extensions): preserve provider metadata

lib/models/track.dart

@@ -27,6 +27,10 @@ class Track {
   final String? albumType;
   final int? totalTracks;
   final String? composer;
+  final String? genre;
+  final String? label;
+  final String? copyright;
+  final String? comment;
   final String? itemType;
   final String? audioQuality;
   final String? audioModes;
@@ -54,6 +58,10 @@ class Track {
     this.albumType,
     this.totalTracks,
     this.composer,
+    this.genre,
+    this.label,
+    this.copyright,
+    this.comment,
     this.itemType,
     this.audioQuality,
     this.audioModes,
@@ -128,6 +136,10 @@ class Track {
       source: effectiveSource,
       albumType: normalizeOptionalString(data['album_type']?.toString()),
       composer: data['composer']?.toString(),
+      genre: data['genre']?.toString(),
+      label: data['label']?.toString(),
+      copyright: data['copyright']?.toString(),
+      comment: data['comment']?.toString(),
       itemType: itemType,
       audioQuality: data['audio_quality']?.toString(),
       audioModes: data['audio_modes']?.toString(),
@@ -158,6 +170,10 @@ class Track {
     String? albumType,
     int? totalTracks,
     String? composer,
+    String? genre,
+    String? label,
+    String? copyright,
+    String? comment,
     String? itemType,
     String? audioQuality,
     String? audioModes,
@@ -185,6 +201,10 @@ class Track {
       albumType: albumType ?? this.albumType,
       totalTracks: totalTracks ?? this.totalTracks,
       composer: composer ?? this.composer,
+      genre: genre ?? this.genre,
+      label: label ?? this.label,
+      copyright: copyright ?? this.copyright,
+      comment: comment ?? this.comment,
       itemType: itemType ?? this.itemType,
       audioQuality: audioQuality ?? this.audioQuality,
       audioModes: audioModes ?? this.audioModes,

lib/models/track.g.dart

@@ -32,6 +32,10 @@ Track _$TrackFromJson(Map<String, dynamic> json) => Track(
   albumType: json['albumType'] as String?,
   totalTracks: (json['totalTracks'] as num?)?.toInt(),
   composer: json['composer'] as String?,
+  genre: json['genre'] as String?,
+  label: json['label'] as String?,
+  copyright: json['copyright'] as String?,
+  comment: json['comment'] as String?,
   itemType: json['itemType'] as String?,
   audioQuality: json['audioQuality'] as String?,
   audioModes: json['audioModes'] as String?,
@@ -60,6 +64,10 @@ Map<String, dynamic> _$TrackToJson(Track instance) => <String, dynamic>{
   'albumType': instance.albumType,
   'totalTracks': instance.totalTracks,
   'composer': instance.composer,
+  'genre': instance.genre,
+  'label': instance.label,
+  'copyright': instance.copyright,
+  'comment': instance.comment,
   'itemType': instance.itemType,
   'audioQuality': instance.audioQuality,
   'audioModes': instance.audioModes,