fix: persistence data loss and better auth error handling

packages/ui/src/components/settings/AntigravitySettings.tsx

@@ -126,7 +126,8 @@ const AntigravitySettings: Component = () => {
             })
 
             if (!response.ok) {
-                throw new Error('Failed to start authentication')
+                const errorData = await response.json().catch(() => ({}))
+                throw new Error(errorData.error || errorData.details || 'Failed to start authentication')
             }
 
             const data = await response.json() as {