- connects WebSocket on mount, sends lobby:join after connection open
- registers handlers for lobby:state, game:question, error messages
- lobby:state updates player list in real time
- game:question navigates to game route (server re-sends via game:ready)
- displays lobby code as copyable button
- host sees Start Game button, disabled until 2+ players connected
- non-host sees waiting message
- cleanup sends lobby:leave and disconnects on unmount
- lobbyIdRef tracks lobby id for reliable cleanup before lobby state arrives
d064338145