- Moved pending-approval extraction to `session-logic` and reused it in `Sidebar` status rendering
- Added `lastVisitedAt` threading persistence through schema, types, hydrate/serialize paths, and tests
- Updated sidebar thread pills for completed/approval states and pulsing working status
- Marked active thread visits and completion visibility timestamps on selection and `turn/completed`
- Co-authored-by: codex <codex@users.noreply.github.com>