Disable the Qt windows 11 theme for now to fix layout issues

There are still some outstanding bugs which have fixes in upcoming Qt releases, which may solve the playbar layout issues:
- https://bugreports.qt.io/browse/QTBUG-130288
- https://bugreports.qt.io/browse/QTBUG-130642

Fixes: #495, #497

source/build/main.cpp

@@ -101,6 +101,10 @@ class Application : public QApplication
 public:
     Application(int &argc, char **argv) : QApplication(argc, argv)
     {
+        // On Windows, avoid the Qt windows11 theme for now since it has various layout issues (#495, #497)
+#ifdef Q_OS_WIN
+        setStyle("windowsvista");
+#endif
     }
 
 protected: