fix: default event list to grid on first load

contao/templates/frontend/event_filter.html.twig

@@ -46,12 +46,59 @@
 
     const targetEventListId = filters.dataset.eventlistId || 'eventlist';
     const list = document.getElementById(targetEventListId);
+    const initialStoredEventListView = (() => {
+        try {
+            return (window.localStorage.getItem('eventlist_view') || '').trim();
+        } catch (error) {
+            return '';
+        }
+    })();
+
+    const applyDefaultGrid = (targetList) => {
+        if (!targetList) {
+            return;
+        }
+
+        targetList.classList.add('event-filter-target-list');
+        targetList.classList.add('grid');
+    };
 
     if (!list) {
         console.warn(`[event_filter] Target event list #${targetEventListId} was not found.`);
+        window.addEventListener('DOMContentLoaded', () => {
+            applyDefaultGrid(document.getElementById(targetEventListId));
+        }, { once: true });
     }
 
-    list?.classList.add('event-filter-target-list');
+    applyDefaultGrid(list);
+
+    window.addEventListener('DOMContentLoaded', () => {
+        window.setTimeout(() => {
+            if ('' !== initialStoredEventListView) {
+                return;
+            }
+
+            const targetList = document.getElementById(targetEventListId);
+
+            if (!targetList) {
+                return;
+            }
+
+            targetList.classList.remove('list');
+            applyDefaultGrid(targetList);
+
+            const toggleToList = document.getElementById('toggletolist');
+            const toggleToGrid = document.getElementById('toggletogrid');
+
+            toggleToList?.classList.remove('disabled');
+            toggleToGrid?.classList.add('disabled');
+
+            try {
+                window.localStorage.setItem('eventlist_view', 'grid');
+            } catch (error) {
+            }
+        }, 0);
+    }, { once: true });
 
     const events = list ? Array.from(list.querySelectorAll(':scope > .event')) : [];
     const tagSelect = filters.querySelector('#tag-filter');