cashu-ts is a library, not an app, neither a mint or a wallet itself. The cashu-ts library is used for the client side, which means that it'll be used in some wallets. So answering your questions: 1) It doesn't affect the UX, rather the DX. 2) cashu-ts has nothing to do with mints. 3) Yes, wallets will still work, the Cashu protocol hasn't changed. But the existent wallets already using cashu-ts will have to put some effort in the migration.