DYN-10464 Fix orbit wheel persisting after releasing ESC key mid-orbit in 3D preview

src/DynamoCoreWpf/Views/Core/DynamoView.xaml.cs

@@ -2365,6 +2365,10 @@ private void DynamoView_KeyUp(object sender, KeyEventArgs e)
             if (dynamoViewModel.BackgroundPreviewViewModel.CanNavigateBackground)
             {
                 dynamoViewModel.BackgroundPreviewViewModel.NavigationKeyIsDown = false;
+                // Release any mouse capture held by the 3D preview viewport
+                // (e.g., during a right-click orbit gesture) so the orbit wheel
+                // indicator disappears immediately when returning to graph view.
+                BackgroundPreview?.ReleaseViewportMouseCapture();
                 dynamoViewModel.EscapeCommand.Execute(null);
                 e.Handled = true;
             }

src/DynamoCoreWpf/Views/Preview/Watch3DView.xaml.cs

@@ -448,6 +448,29 @@
         {
             return View.GetCameraPosition();
         }
+
+        /// <summary>
+        /// Ends any active HelixToolkit camera gesture (e.g. right-click orbit) and
+        /// hides the orbit indicator when switching back to graph view.
+        /// </summary>
+        /// <remarks>
+        /// HelixToolkit's MouseGestureHandler has no LostMouseCapture handler, so
+        /// calling Mouse.Capture(null) alone releases WPF capture but never invokes
+        /// Completed() / HideTargetAdorner(). Raising a synthetic MouseUp causes
+        /// HelixToolkit's OnMouseUp to run, which properly ends the gesture.
+        /// </remarks>
+        internal void ReleaseViewportMouseCapture()
+        {
+            if (watch_view?.IsMouseCaptureWithin ?? false)
+            {
+                Mouse.Capture(null);
+                var args = new MouseButtonEventArgs(Mouse.PrimaryDevice, 0, MouseButton.Right)
+                {
+                    RoutedEvent = UIElement.MouseUpEvent
+                };
+                watch_view.RaiseEvent(args);
+            }
+        }
     }