Add an iPhone client sharing the macOS app's SwiftUI code

mac/Sources/Byre/API.swift

@@ -101,7 +101,11 @@ func errorText(_ error: any Error) -> String {
 }
 
 private let clientID = newID("cli")
-let macName = Host.current().localizedName ?? ProcessInfo.processInfo.hostName
+#if os(macOS)
+let deviceName = Host.current().localizedName ?? ProcessInfo.processInfo.hostName
+#else
+let deviceName = deviceKind
+#endif
 
 final class API: Sendable {
     let origin: URL
@@ -114,7 +118,7 @@ final class API: Sendable {
         config.httpAdditionalHeaders = [
             "Byre-Client": clientID,
             "Byre-Commit": Bundle.main.object(forInfoDictionaryKey: "ByreCommit") as! String,
-            "Byre-Host": macName,
+            "Byre-Host": deviceName,
         ]
         config.proxyConfigurations = [tailnetNode.proxy()]
         session = URLSession(configuration: config, delegate: RequestTiming(), delegateQueue: nil)