refactor(frontend): import宣言周りのエラーを修正 (#12773)

packages/frontend/src/components/page/page.section.vue

@@ -25,7 +25,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { defineAsyncComponent } from 'vue';
 import * as Misskey from 'misskey-js';
-import { SectionBlock } from './block.type';
+import { SectionBlock } from './block.type.js';
 
 const XBlock = defineAsyncComponent(() => import('./page.block.vue'));