Fix nested Task<Task> in BackgroundTagging by adding .Unwrap()

Agent-Logs-Url: https://github.com/Acumatica/Acuminator/sessions/31d400d5-0821-4c79-a697-0d548535a212

Co-authored-by: SENya1990 <7687400+SENya1990@users.noreply.github.com>

Author: Copilot

src/Acuminator/Acuminator.Vsix/Coloriser/AsyncTagging/BackgroundTagging.cs

@@ -47,7 +47,8 @@ public static BackgroundTagging StartBackgroundTagging(PXRoslynColorizerTagger t
 			backgroundTagging.TaggingTask = taggingTask.ContinueWith(task => AfterTaggingActionAsync(task, tagger, backgroundTagging.CancellationToken),  //continuation should be on the UI thread
 																	 backgroundTagging.CancellationToken,
 																	 TaskContinuationOptions.NotOnCanceled,
-																	 _vsTaskScheduler);
+																	 _vsTaskScheduler)
+																	.Unwrap();  // AfterTaggingActionAsync returns Task, so ContinueWith produces Task<Task>. Unwrap() flattens it into a single Task that reflects the full after-tagging workflow.
 			return backgroundTagging;
 		}