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Root cause: ArcoDesign Tree loadMore callback receives NodeInstance where the key is at node.props.dataRef.key, not node.props.key. The old code passed node.props directly which resulted in undefined key, causing child directory loading to silently fail. Fix: - Access node key via node.props.dataRef?.key ?? node.props._key - Add showLine + blockNode + folder icons for better visual hierarchy - Add path display with copy button in selection modal - Add unmountOnExit to reset state on close Closes #19