What's new:

• bugfix: randomize keys for PIN entry
  when picking files, we just skip to showing you the files options (or picking the single winner) rather than talking about it first.
• BIP-39 passphrase process completely streamlined
• batch signing now offered when we see two or more signable PSBT's on the card

-bugfix: can now reformat SD card in B slot
move away from 44' (prime) for hardened derivation paths, in favour of 44h; both accepted for input, but we are going to display 44h style going forward

• bugfix: (QR) or other double-wide chars would be garbled if half off right edge cleanups, bugfixes