Align the body-camera timeline with its sidebar mockup

Draw body_camera_timeline behind a full-height narrow panel, constrain the
content to that column, wrap long event text, and scroll the event list so the
Previous/Next/Close row stays pinned at the bottom. Headless 226/226 verified in
a clean HEAD worktree.

TODO.md

@@ -58,7 +58,7 @@ and scene visuals with those mockups — verified with
 - [ ] Make the HUD match the `targeting_npc` / `escalation_hud` mockups (focus ring, escalation meter, log, hints).
 - [x] Align the pause, settings, and shift-review panels to their mockups.
 - [x] Align the radio and wand panels to their mockups.
-- [ ] Align the body-camera timeline to its mockup.
+- [x] Align the body-camera timeline to its mockup.
 - [ ] Align scene lighting, fog, and post-processing for `venue_overview` and `late_night_avenue`.
 
 ### Verify against the mockups