wallet: restore imported XPub derivation - #1324
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Add wallet-owned public derivation parameters that select accounts by portable name or BIP44 number. Change Signer.DerivePubKey to accept the selector, branch, and child index directly.
Exercise selector-bearing derivation against SQLite while locked. Prove name lookup cannot collide with a numbered account, and verify the exported Signer contract without importing database types.
Refuse private signing for numberless imported-XPub children before account or raw-address secret lookup. Preserve per-address signing only for true raw imports.
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Summary
accounts.
exposing backend account identifiers.
Change Description
Implements roadmap Task 337