fix: Show claim UI instead of loading screen for new users

Changed loading condition from checking rondevu existence to checking setupStep.
New users now see the claim UI immediately instead of being stuck on Loading.

src/App.jsx

@@ -849,7 +849,7 @@ export default function App() {
     }
   };
 
-  if (!rondevu) {
+  if (setupStep === 'init') {
     return <div style={styles.loading}>Loading...</div>;
   }