Fixed in https://github.com/badbundle/vault-app/pull/594 (merged as 377dc7c0).
- After saving, the password screen switches to a centred confirmation: a large green shield that bounces once, "Backup Password Set" or "Changed", and notes about keeping the password safe and about older backups.
- The Backups hub now shows "Backup Password Set ยท Last set " or "No Backup Password", with a Set Up or Change button to match.
- The hub reads the status from the keychain item's attributes only, with interaction disallowed, so it can never prompt for Face ID and never loads the key.