- Restore: live "N / 24 words" count, a one-line birthday explanation, and a guard
that rejects a restore unless all 24 words are entered (the secret scrubber still
wipes the input on the early return).
- Backup: "Show seed" now also shows the birthday (needed to restore quickly) with a
"back this up too" note, a stronger "only way to restore" warning, and a "Save to
file" button that writes the seed + birthday to an owner-only (0600) file in the
config dir via the atomic-write helper.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>