(Testen on Android 10 with Authpass 1.7.10+1612 and dark mode)
When swiping right to copy the username a very bright yellow color is used the background.
Not only is this creates this a very bad contrast to the white font, but also it doens not fit with the color palett at all.
Switching the color to green or something similar would help a lot in my opinion.
Otherwise, thank you very much for the effort put into this amazing project.
Keep it up.