feat: enhance checkout page layout for better responsiveness and adjust cart actions for mobile

src/app/shared/components/cart/cart.component.scss

@@ -87,3 +87,13 @@
   display: flex;
   gap: 12px;
 }
+
+@media (max-width: 767.98px) {
+  .cart-actions {
+    flex-direction: column;
+
+    ::ng-deep app-button {
+      width: 100%;
+    }
+  }
+}

src/app/shared/components/product-column-with-image/product-column-with-image.component.scss

@@ -75,3 +75,9 @@
     }
   }
 }
+
+@media (max-width: 767.98px) {
+  .product-column-with-image {
+    border-color: var(--color-primary, var(--tenant-primary, #009933));
+  }
+}