Track online szinkronizáció refraktorálása

lib/models/track.dart

@@ -61,6 +61,7 @@ enum TrackSyncStatus { pending, synced, error }
 
 class Track {
   final int? id;
+  final String? uuid; // kliens-generált uuid — ez a szerveroldali id is
   final int? projectId;
   final String name;
   final DateTime startTime;
@@ -77,6 +78,7 @@ class Track {
 
   const Track(
       {this.id,
+      this.uuid,
       this.projectId,
       required this.name,
       required this.startTime,
@@ -91,6 +93,7 @@ class Track {
 
   Track copyWith(
           {int? id,
+          String? uuid,
           int? projectId,
           String? name,
           DateTime? startTime,
@@ -104,6 +107,7 @@ class Track {
           String? supabaseId}) =>
       Track(
           id: id ?? this.id,
+          uuid: uuid ?? this.uuid,
           projectId: projectId ?? this.projectId,
           name: name ?? this.name,
           startTime: startTime ?? this.startTime,
@@ -136,6 +140,7 @@ class Track {
 
   Map<String, dynamic> toMap() => {
         if (id != null) 'id': id,
+        if (uuid != null) 'uuid': uuid,
         if (projectId != null) 'project_id': projectId,
         'name': name,
         'start_time': startTime.toIso8601String(),
@@ -151,6 +156,7 @@ class Track {
 
   factory Track.fromMap(Map<String, dynamic> m) => Track(
       id: m['id'] as int?,
+      uuid: m['uuid'] as String?,
       projectId: m['project_id'] as int?,
       name: m['name'] as String,
       startTime: DateTime.parse(m['start_time'] as String),