title: Setting a main window title for macOS SwiftUI app in AppKit?
body: <p>I have a simplistic WKWebView app that opens up a website on macOS, using SwiftUI in AppKit.
  However, the app window has no title - I'm talking of the top row (with the red X to close it, etc.</p>
  <p>How do I set a title there? I've tried looking at Main.Storyboard but am not seeing anything resembling a &quot;title segment&quot;.</p>