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98005ccd57
Phase 2 follow-on: a single self-contained TimelineDebugOverlay over the main timeline so behavior can be watched live while the virtualizer is young. Read-only by design: it only READS state the hook and virtualizer already expose — rendered-rows vs total, msg/divider split, overscan, visible index range, measured row-height min/max, totalSize, scrollTop, clientHeight, isAtBottom, newMessageCount, and the active jump target (deep-link / find / highlight). It never touches, wraps, or perturbs the scroll path, so there is zero risk to sticky-bottom / prepend-retention / deep-link. Ship-then-rip: removal is delete this one file plus its single import + single render line in MessageTimeline.tsx. No flag-gate hook, no localStorage toggle — nothing else references it, so it leaves zero residue. Main timeline only; thread pane untouched. Co-authored-by: Taylor Ho <taylorkmho@gmail.com> Signed-off-by: Taylor Ho <taylorkmho@gmail.com>