Nice !
I will work on the Linux version when the Hotscreen 1.0 will be ready, so I know all the features I have to adapt to Linux. I will maybe ask you some help because I have never used X11 and wayland.
What did you use to annotate images ? I manually annotated my dataset myself... xD
Unless your images are licensed under Creative Commons, I fear to have legal issues of using copyrighted images. Maybe it's stupid considering that many people are selling Loras (image generation models) trained on copyrighted images, but I will try to stay as clean as possible.