[core] added computation when accessing promised store in EssentialExpansionLink

fixes #9

src/components/navigation/EssentialExpansionLink.vue

@@ -47,7 +47,7 @@ export default defineComponent({
   },
   setup(props, { emit }) {
     function isGranted(val: FG_Plugin.MenuLink) {
-      return hasPermissions(val.permissions || []);
+      return computed(() => hasPermissions(val.permissions || []));
     }
     const title = computed(() =>
       typeof props.entry.title === 'function' ? props.entry.title() : props.entry.title