Replace the map room placeholder with a real MapLibre GL dark map (CartoDB
dark_all tiles). Port RoomSync from rmaps-online for WebSocket-based
participant/waypoint sync. Add localStorage room history with thumbnail
capture, participant sidebar with ping buttons, continuous GPS sharing
via watchPosition, and waypoint drop. Demo mode unchanged.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
