The file dialogs from qtquick have a theming issue when used with darker
themes, which has already been fixed upstream (and probably in forky
too) but not in Debian trixie.

KDE bug: https://bugs.kde.org/show_bug.cgi?id=496672
Fix: https://codereview.qt-project.org/c/qt/qtdeclarative/+/651469

The file affected by the fix is
/usr/lib/x86_64-linux-gnu/qt6/qml/QtQuick/Dialogs/quickimpl/qml/FolderBreadcrumbBar.qml
on my system and does not contain the fix.