Drop dead Win32 retained key state

docs/modernization/roadmap.md

@@ -70,6 +70,9 @@ What is already real:
 - `pp_app_core`
 
 Latest slice:
+- `src/platform_windows/windows_window_shell.*` no longer carries the dead
+  retained raw key-state array or its accessor; Win32 key synchronization now
+  relies only on the virtual-key map plus `App` key state.
 - `linux/src/main.cpp` now binds and clears the FPS-title callback directly in
   the Linux entrypoint-owned shell; `App::set_platform_services()` no longer
   installs Linux-specific GLFW title behavior.

docs/modernization/tasks.md

@@ -78,6 +78,8 @@ Completed, blocked, and superseded task history moved to
   the queue is now ordered by code movement instead.
 
 Current slice:
+- `src/platform_windows/windows_window_shell.*` no longer keeps the dead
+  retained raw key-state array.
 - `linux/src/main.cpp` now owns the Linux FPS-title callback lifecycle
   directly, and `src/app_events.cpp` no longer installs Linux-specific title
   behavior from `App::set_platform_services()`.

src/platform_windows/windows_window_shell.cpp

@@ -14,11 +14,6 @@ void destroy_window();
 
 namespace pp::platform::windows {
 
-struct RetainedState final
-{
-    bool keys[256]{};
-};
-
 namespace {
 
 [[nodiscard]] WacomTablet& active_wacom_tablet()
@@ -47,7 +42,7 @@ namespace {
 
 void synchronize_app_key_state_from_keyboard(App& app)
 {
-    static BYTE keys[256];
+    BYTE keys[256];
     if (!GetKeyboardState(keys))
         return;
 
@@ -69,9 +64,7 @@ void synchronize_app_key_state_from_keyboard(App& app)
 
 void initialize_retained_input_state()
 {
-    auto& state = retained_state();
     auto& vkey_map = retained_virtual_key_map();
-    memset(&state.keys, 0, sizeof(state.keys));
     for (int k = 1; k < 256; ++k) // ignore kKey::Unknown = 0
     {
         for (int vk = 0; vk < 256; ++vk)
@@ -93,12 +86,6 @@ void initialize_retained_input_state()
     }
 }
 
-RetainedState& retained_state()
-{
-    static RetainedState state;
-    return state;
-}
-
 pp::platform::windows::VrShellState& pp::platform::windows::retained_vr_shell_state() noexcept
 {
     static pp::platform::windows::VrShellState state;

src/platform_windows/windows_window_shell.h

@@ -7,10 +7,7 @@
 
 namespace pp::platform::windows {
 
-struct RetainedState;
-
 void initialize_retained_input_state();
-RetainedState& retained_state();
 pp::platform::windows::VrShellState& retained_vr_shell_state() noexcept;
 LRESULT CALLBACK main_window_proc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp);