Current limitation: The Diagram component only provides OnShapeClick event. There is no native double-click event for shapes.
Requested feature: Add OnShapeDoubleClick event that:

• Fires when user double-clicks on a shape
• Returns DiagramShapeDoubleClickEventArgs containing the shape Id (similar to DiagramShapeClickEventArgs)
• Allows developers to differentiate between selection (single-click) and action (double-click)

Use case: In workflow editors, single-click should select a shape, while double-click should open an editor dialog. Currently, we have to implement manual timing-based detection which is unreliable and doesn't match native OS double-click behavior.