make demo a GUI application in CMake

Yuhang Zhao

2025-02-10 9e96ea43436d5ed200c57d6b229cddf9bdf9e55a

 examples/qml/QWKButton.qml

@@ -1,5 +1,5 @@
import QtQuick 2.15
import QtQuick.Controls 2.15
import QtQuick.Controls.Basic 2.15

Button {
    id: root