fix: fallback defensivo para logo e sincronizacao de abas do dashboard dev

src/client/pages/DeveloperDashboard.tsx

@@ -24,6 +24,7 @@ export const DeveloperDashboard: React.FC = () => {
     const [appName, setAppName] = useState('');
     const [appSubtitle, setAppSubtitle] = useState('');
     const [logoUrl, setLogoUrl] = useState('');
+    const [logoError, setLogoError] = useState(false);
     const [isSaving, setIsSaving] = useState(false);
     const [isUploading, setIsUploading] = useState(false);
     const fileInputRef = useRef<HTMLInputElement>(null);
@@ -69,6 +70,7 @@ export const DeveloperDashboard: React.FC = () => {
             setAppName(settings.appName);
             setAppSubtitle(settings.appSubtitle);
             setLogoUrl(settings.appLogoUrl || '');
+            setLogoError(false);
         }
     }, [settings]);
 
@@ -298,8 +300,8 @@ export const DeveloperDashboard: React.FC = () => {
                                     <span className="text-xs font-bold text-text-muted uppercase tracking-wider mb-2 block">Preview</span>
                                     <div className="flex items-center gap-3">
                                         <div className="w-10 h-10 rounded-xl bg-gradient-to-br from-indigo-500 to-purple-600 flex items-center justify-center shrink-0 overflow-hidden shadow-lg">
-                                            {logoUrl ? (
-                                                <img src={logoUrl} alt="Preview" className="w-full h-full object-cover" />
+                                            {logoUrl && !logoError ? (
+                                                <img src={logoUrl} alt="Preview" onError={() => setLogoError(true)} className="w-full h-full object-cover" />
                                             ) : (
                                                 <span className="text-white font-black text-xl">{appName?.[0] || 'G'}</span>
                                             )}