make demo a GUI application in CMake

Yuhang Zhao

2025-02-10 9e96ea43436d5ed200c57d6b229cddf9bdf9e55a

 src/core/contexts/win32windowcontext_p.h

@@ -73,7 +73,9 @@
        // WM_MOUSELEAVE.
        bool mouseLeaveBlocked = false;

        // For emulating traditional icon button behavior
        uint64_t iconButtonClickTime = 0;
        int iconButtonClickLevel = 0;
    };

}