App bar being drawn behind status bar on Pixel 8/9

[davecraig]

I saw this on my Pixel 8, and it also happens on Pixel 9 emulator - it looks like this:

Apparently this came in with the Android 15 where edge-to-edge mode was enabled by default (see https://developer.android.com/develop/ui/views/layout/edge-to-edge).

A solution is to set the WindowInsetsPadding to be safeDrawing - I've written a draft PR for this #303. Feedback required on whether this is the standard way of passing modifiers into Screens, it seems like there should be a better way!