refactor(frontend): popupMenuの項目作成時に三項演算子をなるべく使わないように (#14554)

* refactor(frontend): popupMenuの項目作成時に三項演算子をなるべく使わないように

* type import

* fix

* lint

packages/frontend/src/components/MkSelect.vue

@@ -46,7 +46,7 @@ import MkButton from '@/components/MkButton.vue';
 import * as os from '@/os.js';
 import { useInterval } from '@@/js/use-interval.js';
 import { i18n } from '@/i18n.js';
-import { MenuItem } from '@/types/menu.js';
+import type { MenuItem } from '@/types/menu.js';
 
 const props = defineProps<{
 	modelValue: string | null;