Function ChatHub

ChatHub(props: ChatHubProps): ReactElement
ChatHub provides a responsive layout combining a channel sidebar with a message area.
Parameters
- props: ChatHubProps
  Component props
Returns ReactElement
The rendered ChatHub
Remarks
- Desktop: Side-by-side layout (channel list | messages)
- Mobile: State machine — channel list or conversation with back button
- Defined in chat-hub/ChatHub.tsx:39