Add Google Analytics (GA4) with Consent Mode to footer.php: Implemented tracking script that respects user consent for analytics and marketing cookies, enhancing compliance with privacy regulations.

backend/includes/footer.php

@@ -121,6 +121,41 @@
         </div>
     </div>
 
+    <!-- Google Analytics (GA4) mit Consent Mode -->
+    <script>
+        window.dataLayer = window.dataLayer || [];
+        function gtag(){dataLayer.push(arguments);}
+
+        // Standard: keine Analyse/Marketing-Cookies bis zur Einwilligung
+        gtag('consent', 'default', {
+            analytics_storage: 'denied',
+            ad_storage: 'denied',
+            ad_user_data: 'denied',
+            ad_personalization: 'denied'
+        });
+
+        gtag('js', new Date());
+        gtag('config', 'G-EF0E9VPMTD', {
+            anonymize_ip: true
+        });
+
+        // Übergibt Consent-Änderungen aus dem eigenen Cookie-Banner an GA
+        window.addEventListener('cookieConsentUpdated', function (event) {
+            var payload = event && event.detail ? event.detail : {};
+            var consent = payload.consent ? payload.consent : payload;
+            var analyticsGranted = !!(consent && consent.analytics);
+            var marketingGranted = !!(consent && consent.marketing);
+
+            gtag('consent', 'update', {
+                analytics_storage: analyticsGranted ? 'granted' : 'denied',
+                ad_storage: marketingGranted ? 'granted' : 'denied',
+                ad_user_data: marketingGranted ? 'granted' : 'denied',
+                ad_personalization: marketingGranted ? 'granted' : 'denied'
+            });
+        });
+    </script>
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-EF0E9VPMTD"></script>
+
     <script src="/assets/js/main.js" defer></script>
     <script src="/assets/js/cookie-consent.js" defer></script>
     <?php if (isset($additional_scripts)): ?>