make demo a GUI application in CMake

Yuhang Zhao

2025-02-10 9e96ea43436d5ed200c57d6b229cddf9bdf9e55a

 examples/mainwindow/light-style.qss

@@ -1,11 +1,13 @@
/* Window bar */

QWK--WindowBar[bar-active=true] {
    background-color: #195ABE;
    /*background-color: #195ABE;*/
    background-color: transparent;
}

QWK--WindowBar[bar-active=false] {
    background-color: #195ABE;
    /*background-color: #195ABE;*/
    background-color: transparent;
}


@@ -140,12 +142,12 @@

/* Window */

MainWindow[custom-style=true] {
    background-color: transparent;
MainWindow {
    background-color: #F3F3F3;
}

MainWindow[custom-style=false] {
    background-color: #F3F3F3;
MainWindow[custom-style=true] {
    background-color: transparent;
}

QWidget#clock-widget {