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react-chessboard v5 moved all props into an `options` object and renamed several callbacks/style props. The v4-style props were silently ignored, causing pieces to snap back, no legal-move highlights, and no WS events on drop. Also adds a custom promotion dialog since v5 removed the built-in one. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>