web fixes

web/app/cart/page.js

@@ -43,6 +43,9 @@ function PaymentForm({ clientSecret, totalAmount, onSuccess, onCancel }) {
       try {
         await apiCompleteCheckout(token, paymentIntentId);
       } catch {
+        setPayError("Order confirmation failed. Please contact support.");
+        setPaying(false);
+        return;
       }
       onSuccess();
     }