Read the iPhone's own name for its host and tailnet node

mac/Sources/Byre/API.swift

@@ -4,6 +4,9 @@ import HTTPTypes
 import OpenAPIRuntime
 import OpenAPIURLSession
 import os
+#if os(iOS)
+import UIKit
+#endif
 
 let log = Logger(subsystem: "run.fc.byre.mac", category: "byre")
 
@@ -104,7 +107,7 @@ private let clientID = newID("cli")
 #if os(macOS)
 let deviceName = Host.current().localizedName ?? ProcessInfo.processInfo.hostName
 #else
-let deviceName = deviceKind
+let deviceName = MainActor.assumeIsolated { UIDevice.current.name }
 #endif
 
 final class API: Sendable {

mac/Sources/Byre/Phone.swift

@@ -3,6 +3,8 @@ import SwiftUI
 
 final class PhoneDelegate: NSObject, UIApplicationDelegate {
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
+        // deviceName reads UIDevice, which is main-actor only, so it must first be read here.
+        _ = deviceName
         Notifier.shared.install()
         UITextView.appearance().textContainerInset = .zero
         return true