Without UILaunchScreen (or UILaunchStoryboardName) in Info.plist, iOS runs
the app in legacy device-scaling mode and letterboxes it inside a smaller
iPhone-sized window. That's where the unexplained black bars at the top and
bottom of every screenshot came from — the SwiftUI layout was correct all
along, but iOS was rendering the entire app inside a ~75% viewport.
Adding an empty UILaunchScreen dict opts into modern full-screen rendering.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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