Centralize legacy app preferences

docs/modernization/build-inventory.md

@@ -167,6 +167,12 @@ Known local toolchain state:
   Tools, About, history, canvas-clear, and settings execution remain tracked by
   `DEBT-0029`, `DEBT-0030`, `DEBT-0031`, `DEBT-0033`, `DEBT-0034`, and
   `DEBT-0035`.
+- `src/legacy_app_preference_services.*` is the current app-shell bridge for
+  options-menu preference execution. It keeps UI scale, viewport scale, RTL,
+  VR-controller, auto-timelapse, and canvas cursor-mode callbacks on the
+  `pp_app_core` `AppPreferenceServices` contract while retained settings
+  persistence, recording lifecycle, and legacy canvas/UI execution remain
+  tracked by `DEBT-0045`.
 - `src/legacy_canvas_tool_services.*` is the current app-shell bridge for
   canvas toolbar tool selection, NodeCanvas stylus/input mode switching, and
   canvas hotkey/touch execution. It keeps those live paths on the `pp_app_core`
@@ -576,6 +582,10 @@ Known local toolchain state:
   show/hide planning before platform keyboard callbacks, plus cursor visibility
   planning before platform cursor callbacks, plus clipboard read/write
   planning before platform clipboard callbacks.
+- `pp_app_core_app_preferences_tests` covers UI scale/font-scale planning,
+  scale-option selection, viewport scale planning, RTL direction planning,
+  timelapse start/stop/no-op decisions, simple stored preferences, and
+  `AppPreferenceServices` execution dispatch for options-menu side effects.
 - `pp_platform_api_tests` covers service dispatch for clipboard read/write,
   empty clipboard writes, cursor visibility, virtual-keyboard visibility,
   external file display, file sharing, and picker callbacks without platform