Override some Material 3 colors to improve contrast

app/backend/systemproperties.h

@@ -26,6 +26,7 @@ public:
     Q_PROPERTY(QSize maximumResolution MEMBER maximumResolution CONSTANT)
     Q_PROPERTY(QString versionString MEMBER versionString CONSTANT)
     Q_PROPERTY(bool supportsHdr MEMBER supportsHdr CONSTANT)
+    Q_PROPERTY(bool usesMaterial3Theme MEMBER usesMaterial3Theme CONSTANT)
 
     Q_INVOKABLE void refreshDisplays();
     Q_INVOKABLE QRect getNativeResolution(int displayIndex);
@@ -54,5 +55,6 @@ private:
     QList<int> monitorRefreshRates;
     QString versionString;
     bool supportsHdr;
+    bool usesMaterial3Theme;
 };