* [WIP] BAB theme
* [WIP] BAB theme
* Update goldens
* Extract helper function in tests
* Update Goldens version
* Add tests
* [WIP] Hans first round comments
* Added test
* Added docs
* Hans second round comments
* Fixed analyzer error
* Hans third round comments
* ambient
* Change [BottomAppBarTheme.of] to static
* Final doc change