Open this page in several tabs to see real, separate seats join the same room. Connects back to
this same host's /ws path (nginx proxies it to the real
server/room_server.mjs process on 127.0.0.1:8973 -- see
ops/nginx/mixforge-okemily.conf). Turn-order and seat validity are computed by the
real, same room.wasm the server itself calls — this page never reimplements
that logic.