refactor: remove all unused imports (#9951)

Co-authored-by: tamaina <tamaina@hotmail.co.jp>

packages/frontend/src/pages/settings/mute-block.vue

@@ -34,7 +34,6 @@ import MkTab from '@/components/MkTab.vue';
 import FormInfo from '@/components/MkInfo.vue';
 import FormLink from '@/components/form/link.vue';
 import { userPage } from '@/filters/user';
-import * as os from '@/os';
 import { i18n } from '@/i18n';
 import { definePageMetadata } from '@/scripts/page-metadata';