refactor(settings): 重构设置页面，支持语言和地区设置

apps/lib/features/settings/presentation/screens/profile_edit_screen.dart

@@ -14,11 +14,13 @@ class ProfileEditScreen extends StatefulWidget {
     required this.account,
     required this.settings,
     required this.onUploadAvatar,
+    required this.onSave,
   });
 
   final String account;
   final ProfileSettingsV1 settings;
   final Future<ProfileSettingsV1> Function(String filePath) onUploadAvatar;
+  final Future<ProfileSettingsV1> Function(ProfileSettingsV1 updated) onSave;
 
   @override
   State<ProfileEditScreen> createState() => _ProfileEditScreenState();
@@ -191,7 +193,7 @@ class _ProfileEditScreenState extends State<ProfileEditScreen> {
     );
   }
 
-  void _save() {
+  Future<void> _save() async {
     final l10n = AppLocalizations.of(context)!;
     final name = _nameController.text.trim();
     if (name.isEmpty) {
@@ -202,14 +204,33 @@ class _ProfileEditScreenState extends State<ProfileEditScreen> {
       );
       return;
     }
-    Navigator.of(context).pop(
-      widget.settings.copyWith(
-        displayName: name,
-        bio: _bioController.text.trim(),
-        avatarPath: _avatarPath,
-        avatarUrl: _avatarPreviewUrl,
-      ),
+    final updated = widget.settings.copyWith(
+      displayName: name,
+      bio: _bioController.text.trim(),
+      avatarPath: _avatarPath,
+      avatarUrl: _avatarPreviewUrl,
     );
+    try {
+      final saved = await widget.onSave(updated);
+      if (!mounted) {
+        return;
+      }
+      Navigator.of(context).pop(saved);
+    } catch (error, stackTrace) {
+      _logger.error(
+        message: 'Failed to save profile',
+        error: error,
+        stackTrace: stackTrace,
+      );
+      if (!mounted) {
+        return;
+      }
+      Toast.show(
+        context,
+        AppLocalizations.of(context)!.errorRequestGeneric,
+        type: ToastType.error,
+      );
+    }
   }
 
   Future<void> _pickAndUploadAvatar() async {