chore: Nuxt 4 upgrade (#7426)

frontend/app/composables/use-logged-in-state.ts

@@ -0,0 +1,16 @@
+export const useLoggedInState = function () {
+  const auth = useMealieAuth();
+  const route = useRoute();
+
+  const loggedIn = computed(() => auth.loggedIn.value);
+  const isOwnGroup = computed(() => {
+    if (!route.params.groupSlug) {
+      return loggedIn.value;
+    }
+    else {
+      return loggedIn.value && auth.user.value?.groupSlug === route.params.groupSlug;
+    }
+  });
+
+  return { loggedIn, isOwnGroup };
+};