fix issues

apps/website/app/auth/signup/page.tsx

@@ -93,7 +93,7 @@ const FEATURES = [
 export default function SignupPage() {
   const router = useRouter();
   const searchParams = useSearchParams();
-  const { refreshSession } = useAuth();
+  const { refreshSession, session } = useAuth();
   const returnTo = searchParams.get('returnTo') ?? '/onboarding';
   
   const [loading, setLoading] = useState(false);
@@ -111,6 +111,13 @@ export default function SignupPage() {
 
   // Check if already authenticated
   useEffect(() => {
+    if (session) {
+      // Already logged in, redirect to dashboard or return URL
+      router.replace(returnTo === '/onboarding' ? '/dashboard' : returnTo);
+      return;
+    }
+    
+    // If no session, still check via API for consistency
     async function checkAuth() {
       try {
         const response = await fetch('/api/auth/session');
@@ -126,7 +133,7 @@ export default function SignupPage() {
       }
     }
     checkAuth();
-  }, [router, returnTo]);
+  }, [session, router, returnTo]);
 
   const passwordStrength = checkPasswordStrength(formData.password);