Nit: accept also raw public keys, not only npubs:

62cef883863022a4f1d60d54857c9d729650702c9fe227b0988c0b6e36c4bcce

should work as

npub1vt803quxxq32fuwkp42g2lyaw2t9qupvnl3z0vyc3s9kudkyhn8qt28cxv

Nit: when I added the raw public key, the error in the alert is in japanese.

Nice work, loved the roast.