Implement desktop tray interface with media controls and QR pairing; add related tests

Program.cs

@@ -3,6 +3,7 @@ using System.Net.Sockets;
 using System.Security.Cryptography;
 using System.Text;
 using MusicBridge.Agent;
+using MusicBridge.Agent.Desktop;
 using MusicBridge.Agent.Media;
 using MusicBridge.Agent.Network;
 using Windows.Media.Control;
@@ -10,15 +11,17 @@ using Windows.Media.Control;
 Console.OutputEncoding = Encoding.UTF8;
 Console.Title = "MusicBridge Agent";
 var lan = false;
+var tray = false;
 var port = 8765;
 for (var i = 0; i < args.Length; i++)
 {
     if (args[i] == "--lan") lan = true;
+    else if (args[i] == "--tray") tray = true;
     else if (args[i] == "--port" && i + 1 < args.Length && int.TryParse(args[++i], out var parsed) && parsed is > 0 and <= 65535)
         port = parsed;
     else
     {
-        Console.WriteLine("Запуск: dotnet run -- [--lan] [--port 8765]");
+        Console.WriteLine("Запуск: dotnet run -- [--tray] [--lan] [--port 8765]");
         Console.WriteLine("Без --lan соединения разрешены только с этого ПК. Веб-интерфейса нет.");
         return;
     }
@@ -43,12 +46,20 @@ try
     Uri[] qrEndpoints = [];
     using var mdns = new MdnsPublisher(fingerprint, port);
     using var qrWindow = new PairingWindowHost(pairing, fingerprint, () => Volatile.Read(ref qrEndpoints));
+    string networkStatus = lan ? "Подключение к домашней сети…" : "Локальный режим. Для iPhone запусти с --lan.";
+    using var desktop = tray ? new DesktopHost(() => server.Latest, media, pairing,
+        () => Volatile.Read(ref networkStatus), qrWindow.Open, shutdown.Cancel) : null;
+    if (desktop is not null)
+    {
+        await desktop.StartAsync();
+        DesktopHost.FreeConsole();
+    }
     var message = "Готов к управлению.";
     IReadOnlyList<TrustedDevice> displayedDevices = [];
     var nextRefresh = DateTimeOffset.MinValue;
     while (!shutdown.IsCancellationRequested)
     {
-        if (!Console.IsInputRedirected && Console.KeyAvailable)
+        if (!tray && !Console.IsInputRedirected && Console.KeyAvailable)
         {
             var key = Console.ReadKey(intercept: true).Key;
             if (key == ConsoleKey.Q) break;
@@ -105,14 +116,22 @@ try
                     addresses = new List<string> { $"https://127.0.0.1:{port}" };
                     addresses.AddRange(qrEndpoints.Select(u => u.GetLeftPart(UriPartial.Authority)));
                     mdns.Refresh(ips);
+                    Volatile.Write(ref networkStatus, string.Join(" | ", qrEndpoints.Select(u => u.GetLeftPart(UriPartial.Authority))) + "\n" + mdns.Status);
                 }
                 catch (Exception ex)
                 {
                     Volatile.Write(ref qrEndpoints, []);
                     mdns.Refresh([]);
                     message = $"Не удалось обновить адреса: {ex.Message}";
+                    Volatile.Write(ref networkStatus, message);
                 }
             }
+            if (tray)
+            {
+                nextRefresh = DateTimeOffset.UtcNow.AddSeconds(1);
+                await Task.Delay(50, shutdown.Token);
+                continue;
+            }
             if (!Console.IsOutputRedirected) Console.Clear();
             var state = server.Latest;
             Console.WriteLine("MUSICBRIDGE\n");
@@ -154,7 +173,9 @@ try
 catch (OperationCanceledException) when (shutdown.IsCancellationRequested) { }
 catch (Exception ex)
 {
-    Console.Error.WriteLine($"Не удалось запустить или продолжить работу агента: {ex.Message}");
+    var error = $"Не удалось запустить или продолжить работу агента: {ex.Message}";
+    if (tray) MessageBox.Show(error, "MusicBridge", MessageBoxButtons.OK, MessageBoxIcon.Error);
+    else Console.Error.WriteLine(error);
     Environment.ExitCode = 1;
 }