BrownfieldSwiftUIApp.swift

@main
struct BrownfieldSwiftUIApp: App {
  @UIApplicationDelegateAdaptor var delegate: AppDelegate

    var body: some Scene {
        WindowGroup {
          TabView {
            ContentView()
              .tabItem {
                Label("Home", systemImage: "house")
              }
            // Add ReactNative as new tab here
          }
        }
    }
}