fix: enable drag and drop reordering in Edra editor

Add return false to drop handler so ProseMirror's Dropcursor extension can handle the actual node movement. Previously the handler would intercept drops but not perform any movement.

src/lib/components/edra/extensions/drag-handle/index.ts

@@ -387,6 +387,10 @@ export function DragHandlePlugin(options: GlobalDragHandleOptions & { pluginKey:
 						const slice = new Slice(Fragment.from(newList), 0, 0)
 						view.dragging = { slice, move: event.ctrlKey }
 					}
+
+					// Return false to let ProseMirror's default drop handler (from Dropcursor) take over
+					// This allows the actual node movement to happen
+					return false
 				},
 				dragend: (view) => {
 					view.dom.classList.remove('dragging')