I tried the obvious things like using `.onContinuousHover { NSCursur.arrow.set() }`, but it’s just fighting with AppKit. It flickers between the iBeam and arrow cursor constantly when dragging the mouse over the view. It seems clear that the solution is to drop down to AppKit level instead of SwiftUI. No idea if this will work, but I think using an `NSView` in the background of the SwiftUI overlay that explicitly registers an `.arrow` cursor should do the trick.