fixed keybord selection for quit game play

src/states/State.h

@@ -47,6 +47,7 @@ struct StateContext {
     // Menu popups (exposed from main)
     bool* showSettingsPopup = nullptr;
     bool* showExitConfirmPopup = nullptr; // If true, show "Exit game?" confirmation while playing
+    int* exitPopupSelectedButton = nullptr; // 0 = YES, 1 = NO (default)
     // Pointer to the application's StateManager so states can request transitions
     StateManager* stateManager = nullptr;
 };