Feel free to assign this issue to me.

Here are some examples of what I'm thinking. Open to critical feedback.

I tried making "working tree clean" green, but it looked weird. Probably best to keep it the same color as the other text.

I think a dark/faded red background could look good. We could use the same red color as the one from the diff view to keep the theme coherent.

Thanks for the proposal. I think the last image is a little bit too much. Because when looking through the history it forces you always looking on this red banner. I would make something less attracting.

This is only when the option "Show Clean Status" is enabled right?

Current:

Another issue here is that some changes are shown in the treeview, but selecting one does not show the file (Because there are no changes)