Better Highlight for Unread Badge

[chrigi]

Is your feature request related to a problem? Please describe.
The unread chapters badge get's styled according to the theme settings and can become very hard to notice/see.

Describe the solution you'd like
Decouple the theming of the Badge from the selected theme and/or make it more prominent.

Describe alternatives you've considered
The Updates view can be quite cluttered.

Additional context
I chose a theme with a somewhat see-able badge but it looks a lot worse on the phone's screen than on this huge screenshot.