Add InPost Pay integration to admin templates

- Created a new template for the cart rule form with custom label, switch, and choice widgets.
- Implemented the InPost Pay block in the order details template for displaying delivery method, APM, and VAT invoice request.
- Added legacy support for the order details template to maintain compatibility with older PrestaShop versions.

modules/inpostizi/src/Cart/Exception/ProductAlreadyInCartException.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace izi\prestashop\Cart\Exception;
+
+final class ProductAlreadyInCartException extends \RuntimeException
+{
+    /**
+     * @var array cart product
+     */
+    private $product;
+
+    public function __construct(array $product, string $message = '', int $code = 0, \Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+        $this->product = $product;
+    }
+
+    public function getProduct(): array
+    {
+        return $this->product;
+    }
+}

modules/inpostizi/src/Cart/Util/ProductHelper.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace izi\prestashop\Cart\Util;
+
+final class ProductHelper
+{
+    public static function findProductInCart(\Cart $cart, int $productId, int $combinationId, int $customizationId = 0): ?array
+    {
+        foreach ($cart->getProducts() as $product) {
+            if (self::isSameProduct($product, $productId, $combinationId, $customizationId)) {
+                return $product;
+            }
+        }
+
+        return null;
+    }
+
+    public static function isInCart(\Cart $cart, int $productId, int $combinationId, int $customizationId = 0): bool
+    {
+        return null !== self::findProductInCart($cart, $productId, $combinationId, $customizationId);
+    }
+
+    public static function getCartQuantity(\Cart $cart, int $productId, int $combinationId, int $customizationId = 0): int
+    {
+        if (null === $product = self::findProductInCart($cart, $productId, $combinationId, $customizationId)) {
+            return 0;
+        }
+
+        return (int) $product['cart_quantity'];
+    }
+
+    private static function isSameProduct(array $cartProduct, int $productId, int $combinationId, int $customizationId): bool
+    {
+        return $productId === (int) $cartProduct['id_product']
+            && $combinationId === (int) $cartProduct['id_product_attribute']
+            && $customizationId === (int) $cartProduct['id_customization'];
+    }
+}