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d1c7e1c56d
The Chat tab (and floating chat window) both render the shared
ChatMessageList, re-keyed by activeSessionId so it fully remounts on
every session switch. The Virtuoso had no initial-position prop, so a
fresh mount rendered from the top; the only downward scroll driver was
followOutput, which reacts to post-mount data growth and is gated on
isNearBottom. Whether it landed at the bottom depended on a race
(cached sessions resolve synchronously and stuck at the top; fetched
ones sometimes caught a growth tick), producing the inconsistent
top-vs-bottom behavior.
Pin the newly-mounted list to the newest message with
initialTopMostItemIndex={{ index: 'LAST', align: 'end' }} so switching
sessions always lands at the bottom. align: 'end' also bottom-aligns a
last message taller than the viewport.
Co-authored-by: Bohan-J <bohan@devv.ai>
Co-authored-by: multica-agent <github@multica.ai>