Own Linux title callback and trim Win32 key state

docs/modernization/roadmap.md

@@ -70,6 +70,11 @@ What is already real:
 - `pp_app_core`
 
 Latest slice:
+- `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.
+- `src/platform_windows/windows_window_shell.*` now keeps the Win32 virtual-key
+  map outside the retained input-state struct, shrinking that shared pocket.
 - `src/platform_windows/windows_runtime_shell.cpp` no longer keeps a second
   retained `App*` copy alongside `App::I`; the runtime shell now reads the
   bound app directly from the singleton composition edge.

docs/modernization/tasks.md

@@ -78,6 +78,11 @@ Completed, blocked, and superseded task history moved to
   the queue is now ordered by code movement instead.
 
 Current slice:
+- `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.*` now stores the Win32 virtual-key
+  map separately from the retained input-state struct.
 - `src/platform_windows/windows_runtime_shell.cpp` no longer stores a second
   retained `App*` alongside `App::I`.
 - `src/platform_windows/windows_window_shell.*` plus

linux/src/main.cpp

@@ -66,6 +66,9 @@ int main(int argc, char** args)
         return 1;
     }
     pp::platform::legacy::set_legacy_glfw_window(wnd);
+    pp::platform::linux_desktop::set_fps_title_callback([wnd](std::string title) {
+        glfwSetWindowTitle(wnd, title.c_str());
+    });
 
     glfwSetCursorPosCallback(wnd, [](GLFWwindow* wnd, double x, double y){
         g_cursor_pos = glm::vec2(x, y);
@@ -129,6 +132,7 @@ int main(int argc, char** args)
     app.ui_thread_stop();
     app.render_thread_stop();
     app.terminate();
+    pp::platform::linux_desktop::set_fps_title_callback({});
 
     return 0;
 }

src/app_events.cpp

@@ -58,18 +58,6 @@ namespace {
 void App::set_platform_services(pp::platform::PlatformServices* services) noexcept
 {
     platform_services_ = services;
-#ifdef __LINUX__
-    if (services)
-    {
-        pp::platform::linux_desktop::set_fps_title_callback([](std::string title) {
-            pp::platform::legacy::set_legacy_glfw_window_title(title);
-        });
-    }
-    else
-    {
-        pp::platform::linux_desktop::set_fps_title_callback({});
-    }
-#endif
 }
 
 pp::platform::PlatformServices* App::platform_services() const noexcept

src/platform_windows/windows_window_shell.cpp

@@ -14,6 +14,11 @@ void destroy_window();
 
 namespace pp::platform::windows {
 
+struct RetainedState final
+{
+    bool keys[256]{};
+};
+
 namespace {
 
 [[nodiscard]] WacomTablet& active_wacom_tablet()
@@ -36,7 +41,8 @@ namespace {
 
 [[nodiscard]] std::map<kKey, int>& retained_virtual_key_map()
 {
-    return retained_state().vkey_map;
+    static std::map<kKey, int> vkey_map;
+    return vkey_map;
 }
 
 void synchronize_app_key_state_from_keyboard(App& app)

src/platform_windows/windows_window_shell.h

@@ -1,19 +1,14 @@
 #pragma once
 
 #include <Windows.h>
-#include <map>
 
 #include "event.h"
 #include "platform_windows/windows_vr_shell.h"
 
-struct RetainedState
-{
-    bool keys[256]{};
-    std::map<kKey, int> vkey_map;
-};
-
 namespace pp::platform::windows {
 
+struct RetainedState;
+
 void initialize_retained_input_state();
 RetainedState& retained_state();
 pp::platform::windows::VrShellState& retained_vr_shell_state() noexcept;