Route VR mode through app preferences

docs/modernization/roadmap.md

@@ -177,7 +177,7 @@ project-open, app-close, save, save-as, and save-version flows;
 contracts while legacy canvas/project loading remains in place.
 `pp_app_core` also owns tested app preference plans for UI scale/font scale,
 scale option selection, viewport scale, RTL layout direction, timelapse
-recording toggles, VR controller enablement, and canvas cursor mode;
+recording toggles, VR mode start/stop, VR controller enablement, and canvas cursor mode;
 the live tools/options menu and `pano_cli plan-app-preferences` consume those
 contracts. Options-menu preference execution now dispatches through
 `AppPreferenceServices` and `src/legacy_app_preference_services.*` before
@@ -606,7 +606,7 @@ legacy UI/panel/canvas/platform adapters continue execution. The live animation
 panel route now also checks animation panel visibility and applies animation
 panel layout state instead of using the grid panel by mistake.
 Options-menu preference callbacks now dispatch UI scale, viewport scale, RTL,
-VR-controller, auto-timelapse, and cursor-mode side effects through
+VR mode, VR-controller, auto-timelapse, and cursor-mode side effects through
 `AppPreferenceServices` in `src/legacy_app_preference_services.*` before
 retained settings writes, recording lifecycle calls, and legacy canvas/UI
 adapters continue.
@@ -1357,7 +1357,7 @@ Results:
   after options-menu preference execution moved behind app preference services.
 - Focused preference CTest coverage passed for
   `pp_app_core_app_preferences_tests` and the app-preferences CLI smoke tests
-  after the live bridge split.
+  after the live bridge split, including VR mode failed-start status coverage.
 - `pp_app_core_document_recording_tests` passed, covering recording start/stop,
   clear, platform recorded-file cleanup, frame-count reset, export progress
   totals, and oversized progress-total clamping.