Clearing shopping cart

lib/pages/basket.dart

@@ -151,6 +151,23 @@ class _BasketPageState extends State<BasketPage> {
                               ),
                               child: const Text('Оформить заказ'),
                             ),
+                            const SizedBox(height: 10),
+                            ElevatedButton(
+                              onPressed: () async {
+                                await clearCart();
+                                setState(() {
+                                  cartItems = [];
+                                });
+                              },
+                              style: ElevatedButton.styleFrom(
+                                backgroundColor: Theme.of(context).primaryColor,
+                                shape: const RoundedRectangleBorder(
+                                    borderRadius:
+                                        BorderRadius.all(Radius.circular(50))),
+                                foregroundColor: Colors.white,
+                              ),
+                              child: const Text('Очистить корзину'),
+                            ),
                           ],
                         ),
                       ),