Rework post page (lead, pager), add skip link, unified focus ring, reduced motion and keyboard-accessible menu

Elternbeirat.Web/Features/Events/EventCard.razor.css

@@ -27,11 +27,6 @@
     color: var(--color-text);
 }
 
-.event-card-link:focus-visible {
-    outline: 3px solid var(--color-focus);
-    outline-offset: 2px;
-}
-
 .event-details {
     display: flex;
     flex-direction: column;