通知中心封面图显示

部分界面的信息更新
缓存系统初步引入
即将进入播放列表更新

lib/utils/artwork_helper.dart

@@ -2,11 +2,11 @@
 import 'dart:io';
 import 'dart:typed_data';
 import 'package:path_provider/path_provider.dart';
+import 'package:flutter/foundation.dart';
 
 class ArtworkHelper {
   static const String _artworkDir = 'artworks';
 
-  /// 保存封面图到本地
   static Future<String?> saveArtwork(Uint8List data, String songKey) async {
     try {
       final dir = await getApplicationDocumentsDirectory();
@@ -24,7 +24,6 @@ class ArtworkHelper {
     }
   }
 
-  /// 获取封面图文件
   static Future<File?> getArtwork(String songKey) async {
     try {
       final dir = await getApplicationDocumentsDirectory();
@@ -39,7 +38,6 @@ class ArtworkHelper {
     }
   }
 
-  /// 删除封面图
   static Future<void> deleteArtwork(String songKey) async {
     try {
       final dir = await getApplicationDocumentsDirectory();
@@ -47,6 +45,7 @@ class ArtworkHelper {
       final file = File(path);
       if (await file.exists()) {
         await file.delete();
+        debugPrint('🗑️ [ArtworkHelper] deleted artwork: $songKey');
       }
     } catch (e) {
       // ignore