feat(05-purchase-redirect-hardening): harden purchase redirect tracking

Phase 5 complete:

- guard purchase event per transaction in sessionStorage

- restore saved consent before GTM and purchase

- add centered Przelewy24 countdown redirect

templates/site/layout-logged.php

@@ -45,6 +45,38 @@
       'ad_personalization': 'denied',
       'wait_for_update': 500
     });
+
+    (function() {
+      function getCookie(name) {
+        var cookies = document.cookie.split(';');
+        for (var i = 0; i < cookies.length; i++) {
+          var cookie = cookies[i].trim();
+          if (cookie.indexOf(name + '=') === 0) {
+            return decodeURIComponent(cookie.substring(name.length + 1));
+          }
+        }
+
+        return null;
+      }
+
+      try {
+        var consent = JSON.parse(getCookie('cnp_consent'));
+        var preferences = JSON.parse(getCookie('cnp_prefs'));
+
+        if (consent !== true || !Array.isArray(preferences)) {
+          return;
+        }
+
+        gtag('consent', 'update', {
+          'analytics_storage': preferences.indexOf('analytics') > -1 ? 'granted' : 'denied',
+          'ad_storage': preferences.indexOf('marketing') > -1 ? 'granted' : 'denied',
+          'ad_user_data': preferences.indexOf('marketing') > -1 ? 'granted' : 'denied',
+          'ad_personalization': preferences.indexOf('marketing') > -1 ? 'granted' : 'denied'
+        });
+      } catch (error) {
+        console.warn('Consent Mode: could not restore saved cookie preferences.', error);
+      }
+    })();
   </script>
   <!-- End Google Consent Mode v2 - default -->
   <!-- Google Tag Manager -->