Centralize legacy app preferences

docs/modernization/roadmap.md

@@ -179,7 +179,10 @@ contracts while legacy canvas/project loading remains in place.
 scale option selection, viewport scale, RTL layout direction, timelapse
 recording toggles, VR controller enablement, and canvas cursor mode;
 the live tools/options menu and `pano_cli plan-app-preferences` consume those
-contracts while legacy widgets and settings persistence execute them.
+contracts. Options-menu preference execution now dispatches through
+`AppPreferenceServices` and `src/legacy_app_preference_services.*` before
+legacy widgets, settings persistence, recording toggles, and canvas cursor
+updates continue.
 It also owns tested app status/display plans for document title text,
 resolution mapping/labels, DPI text, history-memory text, and recording-frame
 status text, plus renderer diagnostic indicator labels for framebuffer fetch
@@ -602,6 +605,11 @@ dispatch through `ToolsMenuServices` in the shared app-shell bridge before the
 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
+`AppPreferenceServices` in `src/legacy_app_preference_services.*` before
+retained settings writes, recording lifecycle calls, and legacy canvas/UI
+adapters continue.
 `pano_cli plan-about-menu` exposes app-core planning for About menu help,
 about, what's-new, crash-test, and performance-test commands, including
 versioned what's-new labels, diagnostic gating, and no-canvas performance-test
@@ -1345,6 +1353,11 @@ Results:
   `pp_app_core_document_export_tests`, `pano_cli_plan_export_menu_*`,
   `pano_cli_plan_export_target_name_smoke`, and
   `pano_cli_simulate_document_export_smoke`.
+- `PanoPainter`, `pp_app_core_app_preferences_tests`, and `pano_cli` built
+  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.
 - `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.