Fix profile avatar and display name issues

- Increase Dio receiveTimeout to 120s for file uploads
- Reduce WebDAV client timeout to 30s
- Add cache-busting v parameter to avatar URLs
- Add hasChanges logic to disable Save button when no changes made

go_cloud/internal/http/routes.go

@@ -3848,7 +3848,7 @@ func getUserProfileHandler(w http.ResponseWriter, r *http.Request, db *database.
 
 	// If avatar exists, return the backend URL instead of the internal WebDAV URL
 	if user.AvatarURL != nil && *user.AvatarURL != "" {
-		user.AvatarURL = &[]string{"/user/avatar"}[0]
+		user.AvatarURL = &[]string{fmt.Sprintf("/user/avatar?v=%d", time.Now().Unix())}[0]
 	}
 
 	w.Header().Set("Content-Type", "application/json")
@@ -4048,7 +4048,7 @@ func uploadUserAvatarHandler(w http.ResponseWriter, r *http.Request, db *databas
 
 	// Get public URL - for now, construct it manually since Nextcloud doesn't provide direct public URLs
 	// In a real setup, you'd configure Nextcloud to serve public URLs or use a CDN
-	publicURL := "/user/avatar"
+	publicURL := fmt.Sprintf("/user/avatar?v=%d", time.Now().Unix())
 	webdavURL := fmt.Sprintf("%s/%s", client.BaseURL, avatarPath)
 
 	// Update user profile with avatar URL

go_cloud/internal/storage/webdav.go

@@ -42,7 +42,7 @@ func NewWebDAVClient(cfg *config.Config) *WebDAVClient {
 		user:       cfg.NextcloudUser,
 		pass:       cfg.NextcloudPass,
 		basePrefix: strings.TrimRight(base, "/"),
-		httpClient: &http.Client{Timeout: 120 * time.Second},
+		httpClient: &http.Client{Timeout: 30 * time.Second},
 	}
 }