STR:

1. Create calendar using QML (DayOfWeekRow, MonthGrid)
2. Set app color scheme to dark 

   app.styleHints().setColorScheme(PySide6.QtCore.Qt.ColorScheme.Dark)

1. Start app

AB: DayOfWeekRow text has black color and is not visible on dark background

EB: DayOfWeekRow has light color and is visible on dark background

I fixed this problem locally by copying  DayOfWeekRow.qml implementation and adding next line to AbstractDayOfWeekRow delegate:

color: palette.windowText

Hope this will be fixed in next versions so users could avoid copying and patching source code to make it look fine in dark mode