Document LeaveRoomState, LeaveRoomEvent and LeaveRoomRenderer.
The renderer doc records the two things a host screen needs to know, both taken
from LeaveRoomPresenter and LeaveRoomView: it draws nothing until a leave event is
sent, and onSelectNewOwners fires specifically when the user is the last owner of
a room that still has other members.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Benoit Marty
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