added helper menu

src/states/State.h

@@ -49,6 +49,7 @@ struct StateContext {
     int* hoveredButton = nullptr;
     // Menu popups (exposed from main)
     bool* showSettingsPopup = nullptr;
+    bool* showHelpOverlay = nullptr;
     bool* showExitConfirmPopup = nullptr; // If true, show "Exit game?" confirmation while playing
     int* exitPopupSelectedButton = nullptr; // 0 = YES, 1 = NO (default)
     bool* gameplayCountdownActive = nullptr; // True if start-of-game countdown is running