refactor: remove all unused imports (#9951)

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

packages/frontend/src/ui/deck/deck-store.ts

@@ -2,7 +2,6 @@ import { throttle } from 'throttle-debounce';
 import { markRaw } from 'vue';
 import { notificationTypes } from 'misskey-js';
 import { Storage } from '../../pizzax';
-import { i18n } from '@/i18n';
 import { api } from '@/os';
 import { deepClone } from '@/scripts/clone';