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/scripts/media-proxy.ts

@@ -4,7 +4,7 @@
  */
 
 import { MediaProxy } from '@@/js/media-proxy.js';
-import { url } from '@/config.js';
+import { url } from '@@/js/config.js';
 import { instance } from '@/instance.js';
 
 let _mediaProxy: MediaProxy | null = null;