refactor(frontend): frontend-embed/src/to-be-sharedを共通化 (#14536)

* refactor(frontend): shouldCollapsedを共通化

* refactor(frontend): config.js, worker-multi-dispatch.js, intl-const.jsを共通化

* fix(frontend-shared): fix type error

* refactor(frontend): is-link.jsと、同一の振る舞いをする記述を共通化

* fix

* fix lint

* lint fixes

packages/frontend-embed/src/i18n.ts

@@ -6,7 +6,7 @@
 import { markRaw } from 'vue';
 import { I18n } from '@@/js/i18n.js';
 import type { Locale } from '../../../locales/index.js';
-import { locale } from '@/config.js';
+import { locale } from '@@/js/config.js';
 
 export const i18n = markRaw(new I18n<Locale>(locale, _DEV_));