Update templates/cart.html

templates/cart.html

@@ -203,6 +203,7 @@
             .then(response => response.json())
             .then(data => {
                 if (data.success) {
+                    calculateSubtotal();
                     document.querySelector(`input[data-item-name="${itemName}"]`).value = quantity;
                 } else {
                     alert("Error updating quantity: " + data.error);