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/MkMenu.child.vue

@@ -12,7 +12,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { nextTick, onMounted, onUnmounted, provide, shallowRef, watch } from 'vue';
 import MkMenu from './MkMenu.vue';
-import { MenuItem } from '@/types/menu.js';
+import type { MenuItem } from '@/types/menu.js';
 
 const props = defineProps<{
 	items: MenuItem[];