Fix avatar and display name update issues

- Remove avatar handling from profile update to prevent overwriting DB with display URL
- Skip ensureParent for .avatars to speed up upload
- Add change detection for display name save button
- Update API client to not send avatarUrl in profile update

b0esche_cloud/lib/services/api_client.dart

@@ -185,11 +185,9 @@ class ApiClient {
   Future<Map<String, dynamic>> updateUserProfile({
     required String displayName,
     String? email,
-    String? avatarUrl,
   }) async {
     final data = <String, dynamic>{'displayName': displayName};
     if (email != null) data['email'] = email;
-    if (avatarUrl != null) data['avatarUrl'] = avatarUrl;
 
     return putRaw('/user/profile', data: data);
   }

b0esche_cloud/lib/widgets/account_settings_dialog.dart

@@ -24,6 +24,7 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
   bool _isUploadingAvatar = false;
   double _avatarUploadProgress = 0.0;
   String? _error;
+  bool _hasChanges = false;
 
   // Profile fields
   late TextEditingController _displayNameController;
@@ -40,6 +41,11 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
   void initState() {
     super.initState();
     _displayNameController = TextEditingController();
+    _displayNameController.addListener(() {
+      if (mounted && _currentUser != null) {
+        setState(() => _hasChanges = _displayNameController.text != (_currentUser!.displayName ?? ''));
+      }
+    });
     _currentPasswordController = TextEditingController();
     _newPasswordController = TextEditingController();
     _confirmPasswordController = TextEditingController();
@@ -52,6 +58,7 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
           _currentUser = authState.user;
           _displayNameController.text = _currentUser?.displayName ?? '';
           _avatarUrl = _currentUser?.avatarUrl;
+          _hasChanges = false;
         }
       }
     });
@@ -145,6 +152,11 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
     }
   }
 
+  void _onSavePressed() {
+    if (!_hasChanges || _isLoading) return;
+    _updateProfile();
+  }
+
   Future<void> _updateProfile() async {
     if (_currentUser == null) {
       return;
@@ -155,7 +167,6 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
       final apiClient = GetIt.I<ApiClient>();
       await apiClient.updateUserProfile(
         displayName: _displayNameController.text,
-        avatarUrl: _avatarUrl,
       );
 
       final updatedUser = _currentUser!.copyWith(
@@ -641,7 +652,7 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
                 child: SizedBox(
                   width: 144,
                   child: ModernGlassButton(
-                    onPressed: () => _updateProfile(),
+                    onPressed: _onSavePressed,
                     isLoading: _isLoading,
                     child: _isLoading
                         ? const SizedBox(

go_cloud/internal/http/routes.go

@@ -3872,7 +3872,6 @@ func updateUserProfileHandler(w http.ResponseWriter, r *http.Request, db *databa
 	var req struct {
 		DisplayName *string `json:"displayName"`
 		Email       *string `json:"email"`
-		AvatarURL   *string `json:"avatarUrl"`
 	}
 
 	if err = json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -3895,11 +3894,6 @@ func updateUserProfileHandler(w http.ResponseWriter, r *http.Request, db *databa
 		args = append(args, *req.Email)
 		argIndex++
 	}
-	if req.AvatarURL != nil {
-		setParts = append(setParts, fmt.Sprintf("avatar_url = $%d", argIndex))
-		args = append(args, *req.AvatarURL)
-		argIndex++
-	}
 
 	if len(setParts) == 0 {
 		// No fields to update
@@ -3927,9 +3921,6 @@ func updateUserProfileHandler(w http.ResponseWriter, r *http.Request, db *databa
 	if req.Email != nil {
 		metadata["email"] = *req.Email
 	}
-	if req.AvatarURL != nil {
-		metadata["avatarUrl"] = *req.AvatarURL
-	}
 
 	auditLogger.Log(r.Context(), audit.Entry{
 		UserID:   &userID,

go_cloud/internal/storage/webdav.go

@@ -91,10 +91,12 @@ func (c *WebDAVClient) Upload(ctx context.Context, remotePath string, r io.Reade
 	if c == nil {
 		return fmt.Errorf("no webdav client configured")
 	}
-	// Ensure parent collections
+	// Ensure parent collections, skip for .avatars as it should exist
+	if !strings.HasPrefix(remotePath, ".avatars/") {
 		if err := c.ensureParent(ctx, remotePath); err != nil {
 			return err
 		}
+	}
 	// Construct URL
 	// remotePath might be like /orgs/<id>/file.txt; ensure it joins to basePrefix
 	rel := strings.TrimLeft(remotePath, "/")