When a room is opened, load its stored history and keep it live so reloading no
longer loses the conversation.
- bus.subscribeRoom (used by ChatPanel) now runs subscribeRoomWithHistory: it
subscribes live immediately but buffers live messages until the history batch
(oldest -> newest) is delivered, guaranteeing history-first order regardless of
timing; both halves are deduplicated by frame id via a per-room Set. If the
history endpoint is absent (404/500), it falls back to live-only as before.
- toMessage maps an opened frame to the UI Message using ulidTime(msgID) for ts
(not arrival time), so history and live share one clock and sort correctly;
ChatPanel keeps its list ordered by ts.
- Sidebar previews: loadRooms seeds each room's last message/time from
history(id, 1) in the background, without blocking the render and without
overwriting a newer live message; empty rooms keep the "—" placeholder.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
egutierrez
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