tibirna/qgit

AI Summary: When building qgit with Qt6 instead of Qt5, a visual regression occurs where commit label borders are no longer a clean 1px black. Additionally, green labels for local branches display corrupted 'garbage' pixels that change upon redraw. This issue is observed on Debian unstable with Plasma 6, Qt 6.8.2, X11, and 200% global scaling, as illustrated by the provided screenshots.