Change the proxy path from `/journal` to `/.ttrpg` and ensure the
MQTT broker URL points to localhost:3000 during development to
match the CLI server configuration.
Add a suite of dialogs and header components to manage journal
sessions, including:
- ConnectDialog for joining sessions with name and role selection
- CreateSessionDialog for starting new sessions
- InviteDialog for generating and copying player invite links
- SessionDropdown for switching between sessions (GM only)
- JournalHeader for displaying connection status and user info
hypercross