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/boot.ts

@@ -17,7 +17,7 @@ import { applyTheme, assertIsTheme } from '@/theme.js';
 import { fetchCustomEmojis } from '@/custom-emojis.js';
 import { DI } from '@/di.js';
 import { serverMetadata } from '@/server-metadata.js';
-import { url } from '@/config.js';
+import { url } from '@@/js/config.js';
 import { parseEmbedParams } from '@@/js/embed-page.js';
 import { postMessageToParentWindow, setIframeId } from '@/post-message.js';