[FR] Top Bar Color, Icons Scaling and Font Size

[Hosein-Rahnama]

Feature description

I am running the app on Fedora 41, installed from the .rpm package. Below is a picture of how is looks. Although I use the dark mode, the top bar remains white. It would be nice to make this compatible with the dark theme. Also, the size of icons in the side bar and the corresponding font are a little small for me. It would be nice to add some options for scaling these icons and setting the font size.