引入播放列表库，同时引入全新的播放控制器，以控制读库与播放模式的动作，但是功能仍在完善，需要确认部分边界问题

lib/pages/webdav_file_list_page.dart

@@ -1,6 +1,4 @@
 // lib/pages/webdav_file_list_page.dart
-// ignore: unused_import
-import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../services/webdav_service.dart';
@@ -8,6 +6,7 @@ import '../services/playback_service.dart';
 import '../services/audio_service.dart';
 import '../constants/ui_constants.dart';
 import '../base/base_state.dart';
+import '../controllers/playback_controller.dart';
 
 class WebDAVFileListPage extends StatefulWidget {
   final String currentPath;
@@ -53,16 +52,14 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
       final items =
           await WebDAVService.instance.listDirectory(path: _currentPath);
       if (mounted) {
-        // ⭐ 加这个
-        setState(() {
+        safeSetState(() {
           _items = items;
           _isLoading = false;
         });
       }
     } catch (e) {
       if (mounted) {
-        // ⭐ 加这个
-        setState(() {
+        safeSetState(() {
           _errorMessage = '加载失败: $e';
           _isLoading = false;
         });
@@ -82,72 +79,22 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
     );
   }
 
-  // ============================================================
-  // ⭐ 核心：播放歌曲 + 自动构建队列
-  // ============================================================
+// ============================================================
+// 播放单首（点击歌曲）
+// ============================================================
   void _playSong(WebDAVItem file) async {
     try {
-      // 1. 获取当前目录所有音乐文件（过滤掉目录）
-      final musicFiles = _items.where((item) => !item.isDirectory).toList();
-
-      if (musicFiles.isEmpty) {
-        if (mounted) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            const SnackBar(
-              content: Text('当前目录没有音乐文件'),
-              backgroundColor: Colors.orange,
-            ),
-          );
-        }
-        return;
-      }
-
-      // 2. 获取认证头
-      final headers = await WebDAVService.instance.getAuthHeaders();
-
-      // 3. 构建播放队列（所有音乐文件）
-      final queue = musicFiles.map((item) {
-        final itemUrl = WebDAVService.instance.getFileUrl(item.path);
-        return Song(
-          id: item.path,
-          title: item.name.replaceAll(RegExp(r'\.[^.]*$'), ''),
-          artist: '未知艺术家',
-          url: itemUrl,
-        );
-      }).toList();
-
-      // 4. 找到当前点击歌曲在队列中的位置
-      final startIndex = queue.indexWhere((s) => s.id == file.path);
-      if (startIndex == -1) {
-        // 极端情况：队列构建有问题，退化为单曲播放
-        final url = WebDAVService.instance.getFileUrl(file.path);
-        final song = Song(
-          id: file.path,
-          title: file.name.replaceAll(RegExp(r'\.[^.]*$'), ''),
-          artist: '未知艺术家',
-          url: url,
-        );
-        context.read<AudioService>().setQueue([song], startIndex: 0);
-        await PlaybackService().play(url, headers: headers);
-        return;
-      }
-
-      // 5. 设置队列并播放
-      final audioService = context.read<AudioService>();
-      audioService.setQueue(queue, startIndex: startIndex);
-
-      // 6. 播放（AudioService 内部已经调用了 PlaybackService，但为了确保认证头传递）
-      // 这里再显式调用一下，确保认证头正确
-      final targetUrl = queue[startIndex].url!;
-      await PlaybackService().play(targetUrl, headers: headers);
-
-      // 7. 更新 AudioService 的播放状态（确保 UI 同步）
-      // setQueue 已经调用了 _playCurrent()，所以这里不需要重复调用
+      // ⭐ 直接使用 PlaybackController 单例
+      await PlaybackController().playFromWebDAV(
+        directoryPath: _currentPath,
+        clickedSongPath: file.path,
+        allItems: _items,
+      );
 
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(
-            content: Text('正在播放: ${file.name}'),
+            content: Text('正在播放: ${_safeDecode(file.name)}'),
             backgroundColor: const Color(0xFF4CAF50),
             duration: const Duration(seconds: 1),
           ),
@@ -165,47 +112,22 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
     }
   }
 
-  // ============================================================
-  // 全部播放（从第一首开始）
-  // ============================================================
+// ============================================================
+// 全部播放
+// ============================================================
   void _playAll() async {
     try {
-      final musicFiles = _items.where((item) => !item.isDirectory).toList();
-
-      if (musicFiles.isEmpty) {
-        if (mounted) {
-          ScaffoldMessenger.of(context).showSnackBar(
-            const SnackBar(
-              content: Text('当前目录没有音乐文件'),
-              backgroundColor: Colors.orange,
-            ),
-          );
-        }
-        return;
-      }
-
-      final headers = await WebDAVService.instance.getAuthHeaders();
-
-      final queue = musicFiles.map((item) {
-        final itemUrl = WebDAVService.instance.getFileUrl(item.path);
-        return Song(
-          id: item.path,
-          title: item.name.replaceAll(RegExp(r'\.[^.]*$'), ''),
-          artist: '未知艺术家',
-          url: itemUrl,
-        );
-      }).toList();
-
-      final audioService = context.read<AudioService>();
-      audioService.setQueue(queue, startIndex: 0);
-
-      final targetUrl = queue[0].url!;
-      await PlaybackService().play(targetUrl, headers: headers);
+      // ⭐ 全部播放使用 playAllFromWebDAV
+      await PlaybackController().playAllFromWebDAV(
+        directoryPath: _currentPath,
+        allItems: _items,
+      );
 
       if (mounted) {
+        final musicCount = _items.where((item) => !item.isDirectory).length;
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(
-            content: Text('开始播放全部 (${queue.length}首)'),
+            content: Text('开始播放全部 ($musicCount 首)'),
             backgroundColor: const Color(0xFF4CAF50),
             duration: const Duration(seconds: 1),
           ),
@@ -257,7 +179,6 @@ class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
           onPressed: () => Navigator.pop(context),
         ),
         actions: [
-          // 全部播放按钮
           IconButton(
             icon: const Icon(Icons.playlist_play),
             onPressed: _playAll,