Add quit confirmation to main menu

Implement a quit confirmation dialog that appears when the QUIT button is selected on the main menu. The dialog displays 'EXIT GAME?' with YES/NO options. YES sends a coAction quit request to the plugin, which hides the overlay, disconnects any active server session, and sets RE::Main::quitGame to exit the game. NO returns to the main menu. Includes full keyboard (arrow keys, Enter, Escape), gamepad (dpad, A/B buttons), and mouse support. Default selection is NO.

plugin/src/F4TPrismaUI.cpp

@@ -60,6 +60,7 @@ namespace F4T::PrismaUI
 		// several functions call each other out of definition order).
 		void HideMainMenuInternal();
 		void ShowMainMenuInternal();
+		void RequestQuitFromMainMenu();
 		void HideServerBrowserInternal();
 		void ShowServerBrowserInternal();
 		void CreateMainMenuView();
@@ -619,6 +620,30 @@ namespace F4T::PrismaUI
 		RequestNativeCursorRestore();
 	}
 
+	void RequestQuitFromMainMenu()
+	{
+		LogInfo("Quit requested from main menu.");
+
+		HideMainMenuInternal();
+		F4T::Networking::DisconnectFromLocalServer();
+
+		const auto* taskInterface = F4SE::GetTaskInterface();
+		if (!taskInterface) {
+			LogWarning("Game task interface unavailable; cannot queue quit.");
+			return;
+		}
+
+		taskInterface->AddTask([]() {
+			auto* main = RE::Main::GetSingleton();
+			if (!main) {
+				REX::WARN("{} Main singleton unavailable; cannot quit game.", GetLogPrefix());
+				return;
+			}
+
+			main->quitGame = true;
+		});
+	}
+
 	void OnMainMenuDomReady(PrismaView a_view)
 	{
 		g_mainMenuDomReady = true;
@@ -674,7 +699,7 @@ namespace F4T::PrismaUI
 					F4T::MainMenuVanillaSettings::OpenGameSettings();
 					return;
 				} else if (actionName == "quit") {
-					LogInfo("quit requested from main menu (not yet implemented).");
+					RequestQuitFromMainMenu();
 					return;
 				}