追加webdav重新登录的button，还在测试边界情况

lib/base/base_state.dart

@@ -0,0 +1,63 @@
+// lib/base/base_state.dart
+import 'package:flutter/material.dart';
+
+/// 所有页面的基类，提供安全的 setState 封装
+///
+/// 使用方式：
+/// 1. 将页面的 State 类从 `State<YourPage>` 改为 `BaseState<YourPage>`
+/// 2. 将所有 `setState(() { ... })` 替换为 `safeSetState(() { ... })`
+abstract class BaseState<T extends StatefulWidget> extends State<T> {
+  /// 安全的 setState，自动检查 mounted
+  ///
+  /// 用法：
+  /// ```dart
+  /// safeSetState(() {
+  ///   _isLoading = false;
+  /// });
+  /// ```
+  void safeSetState(VoidCallback fn) {
+    if (mounted) {
+      setState(fn);
+    }
+  }
+
+  /// 安全执行异步操作，完成后自动刷新
+  ///
+  /// 用法：
+  /// ```dart
+  /// await safeAsync(
+  ///   () => _loadData(),      // 异步操作
+  ///   () => _isLoading = false, // 完成后执行的 setState
+  /// );
+  /// ```
+  Future<void> safeAsync(
+    Future<void> Function() action,
+    VoidCallback onComplete, {
+    VoidCallback? onError,
+  }) async {
+    try {
+      await action();
+      if (mounted) {
+        setState(onComplete);
+      }
+    } catch (e) {
+      debugPrint('⚠️ [BaseState] safeAsync error: $e');
+      if (mounted) {
+        setState(onComplete);
+      }
+      onError?.call();
+    }
+  }
+
+  /// 显示 SnackBar（封装，确保 mounted）
+  void showSafeSnackBar(String message, {Color? backgroundColor}) {
+    if (!mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(message),
+        backgroundColor: backgroundColor ?? Colors.grey,
+        duration: const Duration(seconds: 2),
+      ),
+    );
+  }
+}

lib/pages/home_page.dart

@@ -7,6 +7,7 @@ import '../widgets/magnetic_scroll_physics.dart';
 import 'webdav_setup_page.dart';
 import 'webdav_file_list_page.dart';
 import '../constants/ui_constants.dart';
+import '../base/base_state.dart';
 
 // ==================================================
 // 歌曲数据模型
@@ -149,7 +150,7 @@ class HomePage extends StatefulWidget {
   State<HomePage> createState() => _HomePageState();
 }
 
-class _HomePageState extends State<HomePage> {
+class _HomePageState extends BaseState<HomePage> {
   List<SongItem> _favorites = [];
   bool _isLoading = true;
 
@@ -282,6 +283,52 @@ class _HomePageState extends State<HomePage> {
     }
   }
 
+  // ⭐ 退出/重新登录对话框
+  void _showReauthDialog() {
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        backgroundColor: const Color(0xFF1A1F1E),
+        title: const Text(
+          '重新登录 WebDAV',
+          style: TextStyle(color: Colors.white),
+        ),
+        content: const Text(
+          '退出当前账号并重新登录？',
+          style: TextStyle(color: Colors.grey),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context),
+            child: const Text('取消'),
+          ),
+          TextButton(
+            onPressed: () async {
+              Navigator.pop(context);
+              await WebDAVService.instance.clearCredentials();
+              setState(() {
+                _favorites = [];
+                _isLoading = false;
+              });
+              if (mounted) {
+                Navigator.pushReplacement(
+                  context,
+                  MaterialPageRoute(
+                    builder: (_) => const WebDAVSetupPage(),
+                  ),
+                );
+              }
+            },
+            child: const Text(
+              '重新登录',
+              style: TextStyle(color: Colors.redAccent),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
   void _resetSnapState() {
     if (_scrollController.hasClients) {
       _scrollController.jumpTo(0.0);
@@ -413,6 +460,25 @@ class _HomePageState extends State<HomePage> {
                                               fontWeight: FontWeight.w400,
                                             ),
                                           ),
+                                          // ⭐ 退出按钮（已连接时显示）
+                                          if (isConnected) ...[
+                                            const Spacer(),
+                                            IconButton(
+                                              icon: const Icon(
+                                                Icons.logout,
+                                                color: Colors.grey,
+                                                size: 18,
+                                              ),
+                                              tooltip: '重新登录',
+                                              onPressed: _showReauthDialog,
+                                              padding: EdgeInsets.zero,
+                                              constraints: const BoxConstraints(
+                                                minWidth: 32,
+                                                minHeight: 32,
+                                              ),
+                                            ),
+                                            const SizedBox(width: 4),
+                                          ],
                                         ],
                                       ),
                                       const SizedBox(height: 4),

lib/pages/player_page.dart

@@ -2,6 +2,7 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import '../services/audio_service.dart';
+import '../base/base_state.dart';
 
 class PlayerPage extends StatefulWidget {
   final VoidCallback? onClose;
@@ -17,7 +18,7 @@ class PlayerPage extends StatefulWidget {
   State<PlayerPage> createState() => _PlayerPageState();
 }
 
-class _PlayerPageState extends State<PlayerPage> {
+class _PlayerPageState extends BaseState<PlayerPage> {
   double? _dragProgress;
 
   String _formatDuration(Duration d) {

lib/pages/webdav_file_list_page.dart

@@ -7,6 +7,7 @@ import '../services/webdav_service.dart';
 import '../services/playback_service.dart';
 import '../services/audio_service.dart';
 import '../constants/ui_constants.dart';
+import '../base/base_state.dart';
 
 class WebDAVFileListPage extends StatefulWidget {
   final String currentPath;
@@ -17,7 +18,7 @@ class WebDAVFileListPage extends StatefulWidget {
   State<WebDAVFileListPage> createState() => _WebDAVFileListPageState();
 }
 
-class _WebDAVFileListPageState extends State<WebDAVFileListPage> {
+class _WebDAVFileListPageState extends BaseState<WebDAVFileListPage> {
   List<WebDAVItem> _items = [];
   bool _isLoading = true;
   String _errorMessage = '';
@@ -43,7 +44,7 @@ class _WebDAVFileListPageState extends State<WebDAVFileListPage> {
   // 加载目录
   // ============================================================
   Future<void> _loadDirectory() async {
-    setState(() {
+    safeSetState(() {
       _isLoading = true;
       _errorMessage = '';
     });
@@ -51,17 +52,23 @@ class _WebDAVFileListPageState extends State<WebDAVFileListPage> {
     try {
       final items =
           await WebDAVService.instance.listDirectory(path: _currentPath);
+      if (mounted) {
+        // ⭐ 加这个
         setState(() {
           _items = items;
           _isLoading = false;
         });
+      }
     } catch (e) {
+      if (mounted) {
+        // ⭐ 加这个
         setState(() {
           _errorMessage = '加载失败: $e';
           _isLoading = false;
         });
       }
     }
+  }
 
   // ============================================================
   // 进入子目录

lib/pages/webdav_setup_page.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import '../services/webdav_service.dart';
 import 'webdav_file_list_page.dart';
+import '../base/base_state.dart';
 
 class WebDAVSetupPage extends StatefulWidget {
   const WebDAVSetupPage({super.key});
@@ -9,7 +10,7 @@ class WebDAVSetupPage extends StatefulWidget {
   State<WebDAVSetupPage> createState() => _WebDAVSetupPageState();
 }
 
-class _WebDAVSetupPageState extends State<WebDAVSetupPage> {
+class _WebDAVSetupPageState extends BaseState<WebDAVSetupPage> {
   final _formKey = GlobalKey<FormState>();
   final _baseUrlController = TextEditingController();
   final _usernameController = TextEditingController();