The returning-user identity-import path (a .backup file or a bare nsec,
existing plumbing since Build 92) is now surfaced as proper centered
buttons instead of a small left-aligned text link.
- Wallet step: a first-class "Import identity" choice stands alongside
Create new / Restore from seed. It composes with either seed choice; the
import panel itself opens on the identity step once the wallet exists.
- Identity step: the left-aligned "Already have an identity? Import it"
link is replaced by a centered secondary button labelled "Import
identity", consistent with the other onboarding buttons. The panel behind
it clearly offers BOTH a .backup file picker and an nsec field.
New keys goblin.onboarding.wallet.import_identity{,_hint} in all six
locales; drift test green.
2ro
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