Publish real virtual-row measurements while suppressing momentum-breaking scroll writes, then reconcile the reader anchor once scrolling settles. Keep live patches out of the timeline during active gestures and add Electron coverage for tall-row overlap, residual motion, and existing-message updates.
Discard virtualizer measurement corrections suppressed during an active user gesture instead of replaying stale offsets at scrollend. Preserve post-scroll live anchoring and add unit plus Electron coverage for ordinary scrolling without updates.
Track real user scrolling through scrollend with a quiet watchdog, defer timeline commits and virtualizer corrections until settlement, and make SessionDetail the sole tail-follow owner. Add unit and Electron regressions for scroll writes, reader anchoring, near-tail escape, explicit navigation, and flap timing.
tommy0103