KarpelesLab / libwallet / 24412128563

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add view accounts (read-only from address or xpub)

View accounts let the user watch a blockchain address or an HD tree
without any backing wallet. They appear in the normal accounts list
(distinguished by Wallet==nil, surfaced as isViewOnly in Dart) and
support balance + NFT queries, but cannot sign.

New endpoint:
- Account:createView {Type, Address?, Xpub?, Name?}
  - Exactly one of Address or Xpub required
  - Xpub only valid for bitcoin-family (enables HD gap-limit scans)
  - Address-only path works for EVM / Solana / single BTC address

Guards added:
- Account.Sign() refuses when view-only (cannot produce signatures)
- Account.check() skips wallet lookup when view-only
- UpdateAddressForNetwork keeps the stored Address for plain-address
  views (no pubkey to re-derive from); just refreshes the URI scheme

Dart:
- client.accounts.createView(type:, address:, xpub:, name:)
- account.isViewOnly getter

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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