When you scroll in the timeline, there’s some interesting behavior with the nav bar title — it collapses to the leading edge rather than the center. The stock nav bar, with centered text and trailing buttons, looks a bit lopsided; this is a nice fix!
Next: card swipe actions. This rounded style is hard to replicate with public APIs, especially SwiftUI List. Most people give up and write a custom implementation, which is a shame since you relinquish a lot of accessibility features when you do that.