feat: implement command handling and custom rendering in editor and message components

src/app/components/editor/index.ts

@@ -1,6 +1,6 @@
 export * from './autocomplete';
 export * from './utils';
-export * from './Editor';
+export { CustomEditor, useEditor, setCommandValidator } from './Editor';
 export * from './Elements';
 export * from './keyboard';
 export * from './output';