Convert desktop to EchoType Bridge: pipe injection via TIP

- Add EchoType to TextInjectionMode enum (becomes default)
- Add WriteToEchoTypePipe(): write [UINT32 cch][WCHAR text] to
  \.\pipe\EchoType\pid_<PID> via NamedPipeClientStream
- InsertText(): route to EchoType pipe when mode is EchoType
- TrayApplicationContext: add 'EchoType (recommended)' to input mode menu
- Update tray branding: 'EchoType Bridge' in tooltips and balloon tips
- AppLogger: log to %LocalAppData%\EchoType\bridge.log

The bridge keeps WebSocket server + UDP discovery + audio control
unchanged. Text injection now goes through the EchoType TIP's
composition-commit mechanism for atomic insertion, falling back to
clipboard and SendInput as secondary options.

Co-Authored-By: Claude <noreply@anthropic.com>

WirelessTextSyncer.Windows/Services/AppLogger.cs

@@ -5,9 +5,9 @@ public static class AppLogger
     private static readonly object SyncRoot = new();
     private static readonly string LogDirectory = Path.Combine(
         Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
-        "WirelessTextSyncer");
+        "EchoType");
 
-    public static string LogPath => Path.Combine(LogDirectory, "desktop.log");
+    public static string LogPath => Path.Combine(LogDirectory, "bridge.log");
 
     public static void Info(string message)
     {

WirelessTextSyncer.Windows/Services/KeyboardInjectionService.cs

@@ -1,9 +1,11 @@
-namespace WirelessTextSyncer.Windows.Services;
-
+using System.IO.Pipes;
 using System.Runtime.InteropServices;
 
+namespace WirelessTextSyncer.Windows.Services;
+
 public enum TextInjectionMode
 {
+    EchoType,
     ClipboardPaste,
     SendInputTyping
 }
@@ -22,7 +24,7 @@ public sealed class KeyboardInjectionService : IKeyboardInjectionService
     private const ushort VirtualKeyV = 0x56;
     private static readonly IntPtr EnglishKeyboardLayout = LoadKeyboardLayout("00000409", KlfActivate);
 
-    public TextInjectionMode Mode { get; set; } = TextInjectionMode.ClipboardPaste;
+    public TextInjectionMode Mode { get; set; } = TextInjectionMode.EchoType;
 
     public void InsertText(string text)
     {
@@ -32,6 +34,12 @@ public sealed class KeyboardInjectionService : IKeyboardInjectionService
         }
 
         AppLogger.Info($"Inserting text length: {text.Length}. Mode: {Mode}.");
+        if (Mode == TextInjectionMode.EchoType)
+        {
+            WriteToEchoTypePipe(text);
+            return;
+        }
+
         if (Mode == TextInjectionMode.SendInputTyping)
         {
             TypeTextWithSendInput(text);
@@ -41,6 +49,50 @@ public sealed class KeyboardInjectionService : IKeyboardInjectionService
         PasteTextViaClipboard(text);
     }
 
+    private static void WriteToEchoTypePipe(string text)
+    {
+        var fgWindow = GetForegroundWindow();
+        if (fgWindow == IntPtr.Zero)
+        {
+            AppLogger.Error("EchoType pipe: no foreground window.");
+            return;
+        }
+
+        GetWindowThreadProcessId(fgWindow, out var pid);
+        if (pid == 0)
+        {
+            AppLogger.Error("EchoType pipe: failed to get PID.");
+            return;
+        }
+
+        var pipeName = $@"EchoType\pid_{pid}";
+
+        try
+        {
+            using var pipe = new NamedPipeClientStream(".", pipeName, PipeDirection.Out);
+            pipe.Connect(timeout: 2000);
+
+            var utf16 = System.Text.Encoding.Unicode.GetBytes(text);
+            var cch = (uint)text.Length;
+            var header = BitConverter.GetBytes(cch);
+
+            pipe.Write(header, 0, 4);
+            pipe.Write(utf16, 0, utf16.Length);
+            pipe.Flush();
+
+            AppLogger.Info($"EchoType pipe: sent {cch} chars to PID {pid}.");
+        }
+        catch (TimeoutException)
+        {
+            AppLogger.Error(
+                $"EchoType pipe: connection timeout for PID {pid}. Is EchoType the active IME in that app?");
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Error($"EchoType pipe write failed for PID {pid}.", ex);
+        }
+    }
+
     private static void TypeTextWithSendInput(string text)
     {
         AppLogger.Info($"Falling back to SendInput text length: {text.Length}");

WirelessTextSyncer.Windows/Tray/TrayApplicationContext.cs

@@ -12,6 +12,7 @@ public sealed class TrayApplicationContext : ApplicationContext
     private readonly Icon connectedIcon;
     private readonly Icon waitIcon;
     private readonly SynchronizationContext uiContext;
+    private ToolStripMenuItem? echoTypeMenuItem;
     private ToolStripMenuItem? clipboardPasteMenuItem;
     private ToolStripMenuItem? sendInputTypingMenuItem;
     private bool? lastConnectionState;
@@ -34,7 +35,7 @@ public sealed class TrayApplicationContext : ApplicationContext
         notifyIcon = new NotifyIcon
         {
             Icon = waitIcon,
-            Text = "WirelessTextSyncer starting...",
+            Text = "EchoType Bridge starting...",
             Visible = true,
             ContextMenuStrip = BuildMenu()
         };
@@ -49,7 +50,7 @@ public sealed class TrayApplicationContext : ApplicationContext
         catch (Exception ex)
         {
             AppLogger.Error("Failed to start tray application.", ex);
-            notifyIcon.BalloonTipTitle = "WirelessTextSyncer";
+            notifyIcon.BalloonTipTitle = "EchoType Bridge";
             notifyIcon.BalloonTipText = $"Failed to start: {ex.Message}";
             notifyIcon.ShowBalloonTip(5000);
         }
@@ -83,6 +84,10 @@ public sealed class TrayApplicationContext : ApplicationContext
     private ToolStripMenuItem BuildInputModeMenu()
     {
         var inputModeMenu = new ToolStripMenuItem("Input mode");
+        echoTypeMenuItem = new ToolStripMenuItem("EchoType (recommended)")
+        {
+            CheckOnClick = false
+        };
         clipboardPasteMenuItem = new ToolStripMenuItem("Clipboard paste")
         {
             CheckOnClick = false
@@ -92,8 +97,10 @@ public sealed class TrayApplicationContext : ApplicationContext
             CheckOnClick = false
         };
 
+        echoTypeMenuItem.Click += (_, _) => SetInputMode(TextInjectionMode.EchoType);
         clipboardPasteMenuItem.Click += (_, _) => SetInputMode(TextInjectionMode.ClipboardPaste);
         sendInputTypingMenuItem.Click += (_, _) => SetInputMode(TextInjectionMode.SendInputTyping);
+        inputModeMenu.DropDownItems.Add(echoTypeMenuItem);
         inputModeMenu.DropDownItems.Add(clipboardPasteMenuItem);
         inputModeMenu.DropDownItems.Add(sendInputTypingMenuItem);
         UpdateInputModeMenuChecks();
@@ -106,13 +113,18 @@ public sealed class TrayApplicationContext : ApplicationContext
         AppLogger.Info($"Text injection mode changed to {mode}.");
         UpdateInputModeMenuChecks();
 
-        notifyIcon.BalloonTipTitle = "WirelessTextSyncer";
+        notifyIcon.BalloonTipTitle = "EchoType Bridge";
         notifyIcon.BalloonTipText = $"Input mode: {GetInputModeLabel(mode)}";
         notifyIcon.ShowBalloonTip(1500);
     }
 
     private void UpdateInputModeMenuChecks()
     {
+        if (echoTypeMenuItem is not null)
+        {
+            echoTypeMenuItem.Checked = keyboard.Mode == TextInjectionMode.EchoType;
+        }
+
         if (clipboardPasteMenuItem is not null)
         {
             clipboardPasteMenuItem.Checked = keyboard.Mode == TextInjectionMode.ClipboardPaste;
@@ -126,7 +138,9 @@ public sealed class TrayApplicationContext : ApplicationContext
 
     private static string GetInputModeLabel(TextInjectionMode mode)
     {
-        return mode == TextInjectionMode.ClipboardPaste ? "Clipboard paste" : "SendInput typing";
+        return mode == TextInjectionMode.EchoType ? "EchoType"
+             : mode == TextInjectionMode.ClipboardPaste ? "Clipboard paste"
+             : "SendInput typing";
     }
 
     private void OnTrayIconClicked(object? sender, MouseEventArgs e)
@@ -140,7 +154,7 @@ public sealed class TrayApplicationContext : ApplicationContext
     private void CopyConnectionAddress()
     {
         Clipboard.SetText($"ws://{server.LocalIpAddress}:{server.Port}");
-        notifyIcon.BalloonTipTitle = "WirelessTextSyncer";
+        notifyIcon.BalloonTipTitle = "EchoType Bridge";
         notifyIcon.BalloonTipText = "Connection address copied.";
         notifyIcon.ShowBalloonTip(1500);
     }
@@ -154,7 +168,7 @@ public sealed class TrayApplicationContext : ApplicationContext
 
         var connected = server.HasClient;
         var status = connected ? "connected" : "waiting";
-        var text = $"WirelessTextSyncer {server.LocalIpAddress}:{server.Port} ({status})";
+        var text = $"EchoType Bridge {server.LocalIpAddress}:{server.Port} ({status})";
         notifyIcon.Icon = connected ? connectedIcon : waitIcon;
         notifyIcon.Text = text.Length > 63 ? text[..63] : text;
 
@@ -168,7 +182,7 @@ public sealed class TrayApplicationContext : ApplicationContext
 
     private void ShowConnectionToast(bool connected)
     {
-        notifyIcon.BalloonTipTitle = "WirelessTextSyncer";
+        notifyIcon.BalloonTipTitle = "EchoType Bridge";
         notifyIcon.BalloonTipText = connected
             ? $"Device connected to {server.LocalIpAddress}:{server.Port}."
             : "Device disconnected. Waiting for connection.";