- Add RunTimeline component with vertical event timeline, collapsible run
cards, per-kind icons, status animations, and agent lane badges
- Add runTimelineFormatting helpers for timestamps, durations, labels,
content truncation, and consecutive thinking-event collapsing
- Integrate Timeline section into ActivityPanel between Agents and Tools
- Wire jump-to-message in App.tsx using DOM data-message-id attributes
on ChatPane messages with smooth scroll and temporary highlight ring
- Add comprehensive unit tests for all formatting helpers
- Update HANDOVER.md to document completed frontend implementation
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
