SwiftUI ↔ UIKit interop (iOS 26)

Bridge the two UI frameworks in both directions. Grounded in Apple's SwiftUI and UIKit documentation.

• SwiftUI wraps UIKit: UIViewRepresentable, UIViewControllerRepresentable.
• UIKit hosts SwiftUI: UIHostingController, UIHostingConfiguration (cells).
• Migration bridge: run both in one app; move screen-by-screen.

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