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.

src/game/game_manager.gd

@@ -27,6 +27,7 @@ const ShiftReview := preload("res://src/game/ui/shift_review.gd")
 const StartMenu := preload("res://src/game/ui/start_menu.gd")
 const PauseOverlay := preload("res://src/game/ui/pause_overlay.gd")
 const SettingsPanel := preload("res://src/game/ui/settings_panel.gd")
+const EventTimeline := preload("res://src/game/ui/event_timeline.gd")
 
 var world_builder: WorldBuilder = null
 var door := DoorState.new()
@@ -70,6 +71,8 @@ var shift_review_panel: ShiftReview = null
 var start_menu: StartMenu = null
 var pause_overlay: PauseOverlay = null
 var settings_panel: SettingsPanel = null
+var event_timeline: EventTimeline = null
+var _timeline_from_review := false
 var _shift_running := false
 var player_settings: Dictionary = {}
 var _focused_avatar: Node3D = null
@@ -325,6 +328,7 @@ func _build_ui() -> void:
 	add_child(shift_review_panel)
 	shift_review_panel.hide()
 	shift_review_panel.restart_requested.connect(_on_review_restart)
+	shift_review_panel.timeline_requested.connect(_open_timeline)
 	shift_review_panel.visible = false
 
 	pause_overlay = PauseOverlay.new()
@@ -340,6 +344,11 @@ func _build_ui() -> void:
 	settings_panel.hide()
 	settings_panel.applied.connect(_on_settings_applied)
 
+	event_timeline = EventTimeline.new()
+	add_child(event_timeline)
+	event_timeline.hide()
+	event_timeline.closed.connect(_on_timeline_closed)
+
 	start_menu = StartMenu.new()
 	add_child(start_menu)
 	start_menu.hide()
@@ -347,6 +356,23 @@ func _build_ui() -> void:
 	start_menu.settings_requested.connect(_open_settings)
 	start_menu.quit_requested.connect(func(): get_tree().quit())
 
+## Body-camera timeline from the review screen (ADR-0005 events, no 3D replay).
+func _open_timeline(review: Dictionary) -> void:
+	if event_timeline == null:
+		return
+	# Hide the review dim so the timeline is not stacked under two overlays.
+	_timeline_from_review = shift_review_panel != null and shift_review_panel.visible
+	if shift_review_panel:
+		shift_review_panel.visible = false
+	event_timeline.show_timeline(review)
+	_refresh_freeze()
+
+func _on_timeline_closed() -> void:
+	if _timeline_from_review and shift_review_panel:
+		shift_review_panel.visible = true
+	_timeline_from_review = false
+	_refresh_freeze()
+
 ## "Run another shift" on the review screen returns to the venue menu.
 func _on_review_restart() -> void:
 	_show_start_menu()
@@ -778,6 +804,9 @@ func _close_top_modal() -> bool:
 		hud.set_action_hint("")
 		_refresh_freeze()
 		return true
+	if event_timeline and event_timeline.visible:
+		event_timeline.close()
+		return true
 	return false
 
 func _open_radial() -> void:
@@ -857,6 +886,8 @@ func _refresh_freeze() -> void:
 		freeze = true
 	if settings_panel and settings_panel.visible:
 		freeze = true
+	if event_timeline and event_timeline.visible:
+		freeze = true
 	if not _shift_running:
 		freeze = true
 	if guard: