Promote uat → main (PROD): GRO-2572 SSO redirect fix (#93)

src/App.tsx

@@ -45,6 +45,12 @@ function LoginPage() {
     if (result?.error) {
       setError(result.error.message ?? "Sign-in failed");
       setIsLoading(false);
+      return;
+    }
+    // Better Auth returns the IdP authorize URL in data.url with redirect:true rather than
+    // issuing an HTTP 30x — the client must follow it (GRO-2572).
+    if (result?.data?.url) {
+      window.location.href = result.data.url;
     }
   };