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/pages/player_page.dart

@@ -130,9 +130,34 @@ class _PlayerPageState extends State<PlayerPage> {
         ),
         centerTitle: true,
         actions: [
-          IconButton(
+          PopupMenuButton<String>(
             icon: const Icon(Icons.more_vert, color: Colors.white54),
-            onPressed: () {},
+            onSelected: (value) async {
+              if (value == 'clear_cache') {
+                final service = context.read<AudioService>();
+                await service.clearCurrentSongCache();
+                if (mounted) {
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    const SnackBar(
+                      content: Text('缓存已清除，重新加载中...'),
+                      backgroundColor: Colors.orange,
+                    ),
+                  );
+                }
+              }
+            },
+            itemBuilder: (context) => [
+              const PopupMenuItem(
+                value: 'clear_cache',
+                child: Row(
+                  children: [
+                    Icon(Icons.cleaning_services, color: Colors.redAccent),
+                    SizedBox(width: 12),
+                    Text('清除缓存'),
+                  ],
+                ),
+              ),
+            ],
           ),
         ],
       ),