Render each QR data module as a Bluesky butterfly instead of a rounded square, using react-native-qrcode-styled's renderCustomPieceItem hook. The finder eyes stay as rounded ring-and-dot shapes and the centered avatar is unchanged.
Butterfly modules cover less of each cell than solid squares, so error correction is raised to H to keep the code scannable. pieceSize is derived from the module count so the QR renders at a fixed size and keeps a consistent white margin inside the card for any handle length.
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