追加webdav重新登录的button，还在测试边界情况

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 = '';
     });
@@ -51,15 +52,21 @@ class _WebDAVFileListPageState extends State<WebDAVFileListPage> {
     try {
       final items =
           await WebDAVService.instance.listDirectory(path: _currentPath);
-      setState(() {
-        _items = items;
-        _isLoading = false;
-      });
+      if (mounted) {
+        // ⭐ 加这个
+        setState(() {
+          _items = items;
+          _isLoading = false;
+        });
+      }
     } catch (e) {
-      setState(() {
-        _errorMessage = '加载失败: $e';
-        _isLoading = false;
-      });
+      if (mounted) {
+        // ⭐ 加这个
+        setState(() {
+          _errorMessage = '加载失败: $e';
+          _isLoading = false;
+        });
+      }
     }
   }