fix selected menu item not updating correctly

src/app/layout/Menu.svelte

@@ -67,7 +67,9 @@
 
   onMount(() => {
     updateActiveNavPath();
-    new MutationObserver(updateActiveNavPath).observe(document.head, { childList: true });
+    // the mutation observer callback runs too fast, hence the call to `updateActiveNavPath` must be wrapped in an empty
+    // setTimeout to not cause any visual bugs
+    new MutationObserver(() => setTimeout(updateActiveNavPath)).observe(document.head, { childList: true });
   });
 
   // functions