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/src/pages/welcome.vue

@@ -15,7 +15,7 @@ import { computed, ref } from 'vue';
 import * as Misskey from 'misskey-js';
 import XSetup from './welcome.setup.vue';
 import XEntrance from './welcome.entrance.a.vue';
-import { instanceName } from '@/config.js';
+import { instanceName } from '@@/js/config.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 import { fetchInstance } from '@/instance.js';