fix(frontend): use exported toast-ui entry to fix nuxt build

frontend/app/components/workspace/documents/MarkdownRichEditor.client.vue

@@ -29,8 +29,7 @@ function looksLikeHtml(value: string) {
 onMounted(async () => {
   if (!mountEl.value) return;
   const [{ default: Editor }] = await Promise.all([
-    // @ts-ignore Package exports for ESM entry do not expose typings correctly.
-    import("@toast-ui/editor/dist/esm/index.js"),
+    import("@toast-ui/editor"),
     import("@toast-ui/editor/dist/toastui-editor.css"),
   ]);