Harden left navigation toggle behavior

patterns/left-navigation.html

@@ -56,7 +56,7 @@
       }
 
       const setMenuState = (expanded) => {
-        menu.hidden = !expanded;
+        menu.hidden = mediaQuery.matches ? !expanded : false;
         toggle.setAttribute('aria-expanded', String(expanded));
         toggle.textContent = expanded ? 'Ausblenden' : 'Einblenden';
         toggle.classList.add('sg-button--active');
@@ -82,10 +82,6 @@
       };
 
       toggle.addEventListener('click', () => {
-        if (!mediaQuery.matches) {
-          return;
-        }
-
         setMenuState(menu.hidden);
       });