Patrick Binder

Overall improvement of the UI, see [milestone v0.8.0](https://github.com/QuantumPhysique/trale/milestone/1) - [x] Add stats widgets screen, #4 - [ ] Improve UI of log screen, #123 - [x] Improve accessibility of font,...

Group the headings Statistics and Measurements with their corresponding sub-parts. How about using `SliverMainAxisGroup` for grouping and `SliverPersistentHeaderDelegate` as persistent header, [see e.g.](https://dartpad.dev/?id=6e2b7245063001576a3a83adb23f1121)