Add custom main-menu overlay & input routing

Integrates a PrismaUI full-screen main-menu overlay with input capture and a bridge to the server browser. Adds F4TMainMenuBridge and F4TMainMenuVanillaSettings stubs, exposes Show/Hide/IsMainMenuVisible/IsCustomMenuInputCaptured in F4TPrismaUI, and routes gamepad input via SetMainMenuActive in F4TMenuInput. MainMenuInject implements robust readiness checks with Bink/frame gating and disables legacy multiplayer-row injection (constexpr false). Fixes cursor clipping by clearing RE::MenuCursor constraints each frame and removes unsupported viewport meta from HTML. Adds window.CO_App/handleControllerInput stubs and updates docs/changelog.

plugin/include/F4TMainMenuBridge.h

@@ -0,0 +1,10 @@
+#pragma once
+
+namespace F4T::MainMenu
+{
+	namespace MainMenuBridge
+	{
+		void ForwardControllerInput(const char* a_button, const char* a_phase);
+		void Initialize();
+	}
+}

plugin/include/F4TMainMenuInject.h

@@ -8,6 +8,7 @@ namespace RE
 namespace F4T::MainMenuInject
 {
 	bool IsMainMenuOnMainPanel(const RE::UI* a_ui);
+	bool IsMainMenuReadyForCustomOverlay(const RE::UI* a_ui);
 	void SetMainMenuInputSuppressed(bool a_suppressed);
 	void Install();
 }

plugin/include/F4TMainMenuVanillaSettings.h

@@ -0,0 +1,7 @@
+#pragma once
+
+namespace F4T::MainMenuVanillaSettings
+{
+	void OpenGameSettings();
+	void Initialize();
+}

plugin/include/F4TMenuInput.h

@@ -10,6 +10,7 @@ namespace F4T::MenuInput
 {
 	void Register();
 	void SetBrowserActive(bool a_active);
+	void SetMainMenuActive(bool a_active);
 	bool IsGamepadConnected();
 	void PollGamepad();
 	bool ForwardButtonEvent(const RE::ButtonEvent* a_event);

plugin/include/F4TPrismaUI.h

@@ -3,7 +3,14 @@
 namespace F4T::PrismaUI
 {
 	void OnGameDataReady();
+	
 	void ShowServerBrowser();
 	void HideServerBrowser();
 	bool IsBrowserVisible();
+	
+	void ShowMainMenu();
+	void HideMainMenu();
+	bool IsMainMenuVisible();
+	
+	bool IsCustomMenuInputCaptured();
 }