refactor: modularize text injection with a factory and dedicated backend implementations, including a new Wayland clipboard option.

IO/TextInjectorFactory.cs

@@ -0,0 +1,23 @@
+using Toak.Core.Interfaces;
+using Toak.IO.Injectors;
+
+namespace Toak.IO;
+
+/// <summary>
+/// Resolves the correct <see cref="ITextInjector"/> implementation based on the configured backend name.
+/// </summary>
+public static class TextInjectorFactory
+{
+    /// <summary>
+    /// Creates the appropriate <see cref="ITextInjector"/> for the given <paramref name="backend"/> string.
+    /// Supported values: <c>wtype</c>, <c>wl-clipboard</c>, <c>ydotool</c>, <c>xdotool</c> (default).
+    /// </summary>
+    public static ITextInjector Create(string backend, INotifications notifications) =>
+        backend.ToLowerInvariant() switch
+        {
+            "wtype"        => new WtypeTextInjector(notifications),
+            "wl-clipboard" => new WlClipboardTextInjector(notifications),
+            "ydotool"      => new YdotoolTextInjector(notifications),
+            _              => new XdotoolTextInjector(notifications)
+        };
+}