Mobile client Drag & Drop Preview

[KittenBrix]

react drag and drop touch backend package doesn't provide a way to set a drag preview when dragging a draggable component.
add in feature (suggested: package react-dnd-preview) to supply previewing capability to mobile devices. Benefits of this include identifying when a touch stroke is actually considered a drag (prevent inadvertently swiping cards from one area to another), and being able to see which element is currently being moved.