Yeah, but a cashu is just a large qr code that a sane recipient must immediately claim via lightning from the mint. No privacy improvement. The good old Phoenix is better imho.
Nope. The recipient immediately clears by swapping the token with the mint for a new proof. It doesn’t touch Lightning at all. As for the QR code, it just conveys handshake information- all payloads, including the tokens are transmitted via NWC-like backend channel.