i'm totally confounded by how swiftui focus works with things like List or NavigationSplitView which handles/owns kb/mouse list item selection (but, weirdly, not focus) and won't report it to descendants in any meaningful way.

the only silver lining here is that because i'm porting a react redux app to swift ui, i already rely on selection being managed, so i can use that bound value, but it's confounding that focus ends up being something else altogether