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* fix(transcript): auto-follow live task output in transcript dialog (#5921) Since the transcript event list moved to Virtuoso (#5733), a live task's new events required manual scrolling to see — the dialog opened at the top and never followed appended output. Wire live-follow through Virtuoso's own primitives, per sort direction: - Chronological (default): `followOutput` returns "smooth" while the task is live and the reader is at the bottom (Virtuoso's own atBottom tracking, with a forgiving 120px threshold). Scrolling up suspends the follow until the reader returns. - Newest-first: growth is PREPENDS, which the firstItemIndex anchoring deliberately holds in place — so a reader parked at the top would silently stop seeing new rows. Track the top edge via `atTopStateChange` into a ref and snap back to index 0 when new events arrive while at the top. Readers who scrolled away are left in place. - Opening a live chronological transcript now lands on the newest event (`initialTopMostItemIndex: LAST/end`, same pattern as the chat list); the per-listEpoch remount re-applies it after task/sort/filter changes. Completed tasks keep opening at the top. Fixes #5921. * fix(transcript): rework newest-first live follow as a user-intent latch (#5921) The previous approach gated the newest-first follow on "is the viewport at the top right now" — but firstItemIndex prepend anchoring moves the viewport away from the top on every flush, so the signal broke itself: after the first prepend the follow silently disengaged and never recovered. Replace it with a pure latch controller (transcript-follow.ts): - Disengage only on accumulated USER displacement (wheel/touch/key deltas, scrollbar drag) beyond the 120px edge zone; system displacement never counts, no matter how far it pushes the viewport. - While following, non-user displacement is pinned back to the live end on the scroll event itself (Virtuoso's prepend compensation lands after React effects, so an effect-timed snap alone stays one flush behind). - Enforcement is suppressed while the mouse is held (text-selection autoscroll) or mid-gesture; returning within the edge zone re-engages. - Timeline segment clicks explicitly unlatch so navigation isn't pinned back. Chronological followOutput switches "smooth" -> "auto": a still-animating smooth scroll reads as "not at bottom" on the next flush and drops the follow under rapid appends. The latch decision table is unit-tested (transcript-follow.test.ts), and the mechanism was validated end-to-end against react-virtuoso 4.18.7 in a browser harness: follow-at-top, in-zone nudge + flush (no false disengage), scroll-away with stable anchor, return-to-top re-engage, rapid flushes. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> --------- Co-authored-by: Naiyuan Qing <145280634+NevilleQingNY@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>