Split mac UI state saving

docs/modernization/debt.md

@@ -61,6 +61,12 @@ agent or engineer to remove them without reconstructing context from chat.
 - 2026-06-13: `PLT-006` was narrowed again. macOS cursor visibility now routes
   through the Apple service boundary instead of the catch-all legacy adapter;
   the Apple path still owns the OS-specific cursor toggle.
+- 2026-06-13: `PLT-007` was narrowed again. macOS UI-state saving now routes
+  through the Apple service boundary instead of the catch-all legacy adapter;
+  the Apple path still owns the OS-specific UI-state save call.
+- 2026-06-13: `PLT-007` was narrowed again. macOS UI-state saving now routes
+  through `src/platform_apple/apple_platform_services.*` instead of the
+  catch-all legacy adapter; the Apple path still owns the OS-specific save call.
 - 2026-06-13: `DEBT-0036` was narrowed again. `NodeStrokePreview::draw_stroke_immediate()`
   now routes final composite execution and preview copy-back through a retained
   local wrapper, leaving the call site with only sequence wiring.

docs/modernization/tasks.md

@@ -1362,6 +1362,40 @@ Completed Task Log:
 | --- | --- | ---: | --- | --- |
 | 2026-06-13 | PLT-006 | +1 platform alignment and package parity | `ctest --preset desktop-fast --build-config Debug -R pp_platform_api_tests --output-on-failure`; `cmake --build --preset windows-msvc-default --config Debug --target pp_platform_api_tests` | `fc4f5e40` |
 
+### PLT-007 - Split Mac UI State Saving From Legacy Platform Adapter
+
+Status: Done
+Score: +1 platform alignment and package parity
+Debt: `DEBT-0017`, `DEBT-0052`
+Scope: `src/platform_legacy/legacy_platform_services.cpp`,
+`src/platform_apple/apple_platform_services.*`
+
+Goal:
+
+Move macOS UI-state saving out of the catch-all legacy platform adapter into
+the Apple platform service boundary. Preserve current macOS UI-state saving
+behavior and keep non-macOS behavior unchanged.
+
+Done Checks:
+
+- `src/platform_legacy/legacy_platform_services.cpp` no longer owns the macOS
+  UI-state save branch.
+- macOS UI-state saving still dispatches through the Apple service path.
+- The debt log records the reduced macOS platform tail.
+
+Validation:
+
+```powershell
+ctest --preset desktop-fast --build-config Debug -R pp_platform_api_tests --output-on-failure
+cmake --build --preset windows-msvc-default --config Debug --target pp_platform_api_tests
+```
+
+Completed Task Log:
+
+| Date | Task | Score | Validation | Commit |
+| --- | --- | ---: | --- | --- |
+| 2026-06-13 | PLT-007 | +1 platform alignment and package parity | `ctest --preset desktop-fast --build-config Debug -R pp_platform_api_tests --output-on-failure`; `cmake --build --preset windows-msvc-default --config Debug --target pp_platform_api_tests` | `pending` |
+
 ### STR-010 - Extract Remaining Draw Merge Composite Orchestration
 
 Status: Done