Normalize Comment Terminology

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

UI/FFmpegDownloadUI.cs

@@ -25,9 +25,9 @@ namespace ADOFAIRenderer.UI;
 /// <c>RenderMod.OnInitializeMelon</c>).
 /// </para>
 /// <para>
-/// Threads: UI construction and all Unity object access happen on the Unity main thread. The download and extraction
+/// Threads: UI construction and all Unity object access happen on the main Unity thread. The download and extraction
 /// run on thread-pool threads (<see cref="Task.Run(Func{Task})"/>); they post UI updates to
-/// <see cref="_mainThreadQueue"/>, which <see cref="Update"/> drains on the main thread.
+/// <see cref="_mainThreadQueue"/>, which <see cref="Update"/> drains on the main Unity thread.
 /// </para>
 /// <para>
 /// Flow: buttons -> (Download) progress bar + status text -> download to a temporary archive in UserLibs -> extract
@@ -70,7 +70,7 @@ internal class FFmpegDownloadUI : MonoBehaviour
         
     /// <summary>Cancellation for the running download; created per download, cancelled by Cancel, disposed in OnDestroy.</summary>
     private System.Threading.CancellationTokenSource? _cts;
-    /// <summary>Actions posted from background threads, run in order on the main thread by <see cref="Update"/>.</summary>
+    /// <summary>Actions posted from background threads, run in order on the main Unity thread by <see cref="Update"/>.</summary>
     private readonly System.Collections.Concurrent.ConcurrentQueue<Action> _mainThreadQueue = new();
 
     /// <summary>
@@ -376,7 +376,7 @@ internal class FFmpegDownloadUI : MonoBehaviour
     /// <summary>Runs every action posted by the background download task, in posting order.</summary>
     private void Update()
     {
-        // Execute queued actions on main thread
+        // Execute queued actions on main Unity thread
         while (_mainThreadQueue.TryDequeue(out var action))
         {
             action?.Invoke();
@@ -384,7 +384,7 @@ internal class FFmpegDownloadUI : MonoBehaviour
     }
 
     /// <summary>
-    /// Posts an action to run on the main thread during the next <see cref="Update"/>. Safe to call from any thread.
+    /// Posts an action to run on the main Unity thread during the next <see cref="Update"/>. Safe to call from any thread.
     /// Actions posted after the dialog is destroyed are never run.
     /// </summary>
     private void ExecuteOnMainThread(Action action)
@@ -458,7 +458,7 @@ internal class FFmpegDownloadUI : MonoBehaviour
                 // Keep the "complete" message visible for 1000 ms before closing
                 await Task.Delay(1000);
 
-                // Destroy UI on main thread. FirstUpdateHook then sees Instance == null and checks the libraries again.
+                // Destroy UI on main Unity thread. FirstUpdateHook then sees Instance == null and checks the libraries again.
                 ExecuteOnMainThread(() =>
                 {
                     Destroy(gameObject);
@@ -513,7 +513,7 @@ internal class FFmpegDownloadUI : MonoBehaviour
         Destroy(gameObject);
     }
 
-    /// <summary>Posts a status text and color change to the main thread. Callable from any thread.</summary>
+    /// <summary>Posts a status text and color change to the main Unity thread. Callable from any thread.</summary>
     private void UpdateStatus(string message, Color color)
     {
         ExecuteOnMainThread(() =>
@@ -526,7 +526,7 @@ internal class FFmpegDownloadUI : MonoBehaviour
         });
     }
 
-    /// <summary>Posts a progress bar update to the main thread. Callable from any thread.</summary>
+    /// <summary>Posts a progress bar update to the main Unity thread. Callable from any thread.</summary>
     /// <param name="percent">Filled fraction 0..1 (not 0..100); becomes the fill's <c>anchorMax.x</c>.</param>
     /// <param name="text">Text shown on the bar.</param>
     private void UpdateProgress(float percent, string text)