Normalize Comment Terminology

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

UI/CommonWarningDialogUI.cs

@@ -21,7 +21,7 @@ internal class DialogButton
     public string Text;
 
     /// <summary>
-    /// Action run on the Unity main thread when the button is clicked. The dialog is destroyed after the action
+    /// Action run on the main Unity thread when the button is clicked. The dialog is destroyed after the action
     /// returns, also when the action throws (the exception is logged).
     /// </summary>
     public Action OnClick;
@@ -49,7 +49,7 @@ internal class DialogButton
 /// canvas: a translucent full-screen backdrop that blocks input to everything below, and an O5Kit window on top of it.
 /// While the dialog exists, every enabled UI Toolkit root (<see cref="UIDocument"/>) is disabled so that it cannot
 /// receive input; the roots are enabled again in <see cref="OnDestroy"/>. Clicking any button runs its action and then
-/// destroys the dialog. All members run on the Unity main thread.
+/// destroys the dialog. All members run on the main Unity thread.
 /// </para>
 /// </summary>
 internal class CommonWarningDialogUI : MonoBehaviour
@@ -97,7 +97,7 @@ internal class CommonWarningDialogUI : MonoBehaviour
     }
 
     /// <summary>
-    /// Creates and shows a new dialog. Must be called on the Unity main thread.
+    /// Creates and shows a new dialog. Must be called on the main Unity thread.
     /// </summary>
     /// <param name="title">Window title text.</param>
     /// <param name="description">Body text, centered and word-wrapped; TextMeshPro rich text tags are allowed.</param>