fix: Poprawki dataLayer GA4 — purchase price, format kluczy, fałszywa konwersja GADS

- purchase: id→item_id (string), name→item_name, price fallback na price_brutto gdy brak promo, user_data poza ecommerce
- begin_checkout: id→item_id, name→item_name, dodano google_business_vertical
- Usunięto fałszywą konwersję GADS (gtag conversion) ze strony checkout
- view_item: dodano currency PLN, price jako number zamiast string
- Dodano event view_cart na stronie koszyka
- add_to_cart: quantity parseInt zamiast string

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates_user/shop-order/order-details.php

@@ -170,25 +170,27 @@
             currency: "PLN",
             value: <?= \Shared\Helpers\Helpers::normalize_decimal( round( $this -> order['summary'], 2 ) ) - str_replace( ',', '.', round( $this -> order['transport_cost'], 2 ) );?>,
             shipping: <?= \Shared\Helpers\Helpers::normalize_decimal( $this -> order['transport_cost'] );?>,
-            user_email: "<?= $this -> order['client_email'] ?>",
-            user_phone: "<?= $this -> order['client_phone'] ?>",
-            user_name: "<?= $this -> order['client_name'] ?>",
-            user_surname: "<?= $this -> order['client_surname'] ?>",
-            user_street: "<?= $this -> order['client_street'] ?>",
-            user_city: "<?= $this -> order['client_city'] ?>",
-            user_country: "Polska",
-            user_postal_code: "<?= $this -> order['client_postal_code'] ?>",
             items: [
               <? foreach ( $this -> order['products'] as $product ):?>
               {
-                id: <?= (int)$product['product_id'];?>,
-                name: '<?= $product['name'];?>',
-                quantity: <?= $product['quantity'];?>,
-                price: <?= $product['price_brutto_promo'];?>,
+                item_id: "<?= $product['product_id'];?>",
+                item_name: '<?= $product['name'];?>',
+                quantity: <?= (int)$product['quantity'];?>,
+                price: <?= (float)$product['price_brutto_promo'] > 0 ? \Shared\Helpers\Helpers::normalize_decimal( $product['price_brutto_promo'] ) : \Shared\Helpers\Helpers::normalize_decimal( $product['price_brutto'] );?>,
                 google_business_vertical: 'retail'
               }<? if ( $product != end( $this -> order['products'] ) ) echo ',';?>
             <? endforeach;?>
             ]
+          },
+          user_data: {
+            email: "<?= $this -> order['client_email'] ?>",
+            phone_number: "<?= $this -> order['client_phone'] ?>",
+            first_name: "<?= $this -> order['client_name'] ?>",
+            last_name: "<?= $this -> order['client_surname'] ?>",
+            street: "<?= $this -> order['client_street'] ?>",
+            city: "<?= $this -> order['client_city'] ?>",
+            country: "PL",
+            postal_code: "<?= $this -> order['client_postal_code'] ?>"
           }
         });
       <? endif;?>