At the 2000-message cap the count stops changing, so the page stopped
following the newest message, and every row's index key shifted on each
arrival, remounting all of them. Each message now gets an id when it
arrives; the rows key on it and the scroll follows the newest id. Rows
are memoised on the message, and the events of one frame join the list
in a single update.
/messages reads GET /api/messages/stream. A history select picks the window
(live only up to 24 hours) and a filter keeps the messages whose sender or
recipient contains the text. Each message is a row of the terminal list an
agent's terminal uses: one summary line with the time, the two parties and
the start of the body, and the whole body under it. The list follows the
newest message and holds the last 2000.
The feed has no event id, so a reconnect sends the history again. The page
empties its list each time the connection opens and fills it from the
replay, where the terminal stream hook, which keeps its rows across a
reconnect, would list every message twice.
The stream URL, filter, cap and row logic is in its own module with tests,
and docs/swarm/ui.md describes the page.
