BUG: Message history fails to load

Description:

EmbeddedChat has stopped loading previous messages after the recent merges.

The client ends up calling the private room history endpoint for a public room. For example, for the public room GENERAL, it sends:

GET /api/v1/groups.messages?roomId=GENERAL

That returns 400 Bad Request, and the chat history does not load.

Steps to reproduce:

1. Run EmbeddedChat/Storybook against a Rocket.Chat workspace that has a public room like GENERAL and at least one private room.
2. Open a story and join any public room.
3. Check the network tab and the chat history loading behavior.

Expected behavior:

EmbeddedChat should detect the active room type correctly and use the matching endpoint every time.

For a public room like GENERAL, it should call:

GET /api/v1/channels.messages?roomId=GENERAL

Previous messages should load normally.

Actual behavior:

EmbeddedChat calls:

GET /api/v1/groups.messages?roomId=GENERAL

That request returns 400 Bad Request, and previous messages/chat history do not load.

Screenshot

Start by tracing the message-history loading path used by EmbeddedChat/Storybook and inspect how the active room type selects its endpoint. Reproduce the issue with a public room such as GENERAL and a private room, then verify that public rooms use channels.messages, private rooms use groups.messages, and previous messages load successfully.