Add body-camera timeline to the shift review

- New src/game/ui/event_timeline.gd flattens every recorded incident event
  (ADR-0005) into one time-ordered list and shows time, person, and a one-line
  summary. Step with Left/Right or the buttons; Esc returns to the review. No live
  3D replay in this first version.
- Shift review gains a "Body camera timeline" button that hands the review to the
  timeline; the review dim is hidden while it is open (stacked overlays made the
  screen nearly black) and restored on close.
- ShiftCoordinator records started_at_ms so the review can stamp events as mm:ss.
- 8 new string keys for the timeline UI and the review button.

Tests/docs
- Headless suite 113 -> 120 (test_event_timeline.gd), new smoke_timeline.gd that
  opens the timeline from the review, steps through every event, and closes back.
- README, TODO section moved to DONE, MEMORY notes. Version 0.2.6.

DONE.md

@@ -486,3 +486,11 @@ wants evacuation, a closed street, and an investigation when the call was unjust
 - [x] Unjustified emergency (low danger, no weapon) writes an investigation note on the shift
       review and applies the existing false-report / reputation hit.
 - [x] Review copy names the responder outcome, not only battery and crowd %.
+
+## Body-camera replay
+
+Completed 2026-10-31 (working tree). Headless **120/120**; `src/test/smoke_timeline.gd` opens the timeline from the review, steps through every event, and returns to the review.
+
+
+- [x] Shift review: a timeline of recorded incident events (ADR-0005 already stores them).
+      Scrub or step through; no live 3D replay required in the first version.