macos: route IME preedit commits through key events

macos/Sources/Ghostty/Surface View/SurfaceView_AppKit.swift

@@ -2042,6 +2042,8 @@ extension Ghostty.SurfaceView: NSTextInputClient {
             return
         }
 
+        let hadMarkedText = hasMarkedText()
+
         // If insertText is called, our preedit must be over.
         unmarkText()
 
@@ -2053,6 +2055,13 @@ extension Ghostty.SurfaceView: NSTextInputClient {
             return
         }
 
+        if hadMarkedText, !chars.isEmpty {
+            // Send preedit commits as key events instead of raw text for
+            // keybind interpretation by programs.
+            _ = committedPreeditTextAction(GHOSTTY_ACTION_PRESS, text: chars)
+            return
+        }
+
         surfaceModel.sendText(chars)
     }