[FEAT] auto screen mode by default

**Is your feature request related to a problem? Please describe.**
only light or dark is possible in the hatchet ui

**Describe the solution you'd like**
auto/system should be the default and selectable, like in the docs

**Describe alternatives you've considered**
switching manually is too much work :D

**Additional context**
Add any other context or screenshots about the feature request here.
