KarpelesLab / libwallet / 24765627716

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Web3: skip chain_switch prompt when no candidate network or account

Previous chain_switch detection (commit 934bf82) intercepted any
action method on a different chain family, even when the wallet
had nothing the user could pick — a Solana-only wallet hit
4901 'no bitcoin account available' on mpurse_signMessage instead
of falling through to the original mpurse handler.

That broke three existing test-host tests (mpurse_getAddress,
mpurse_signRawTransaction, mpurse_sendAsset) that expected the
old fall-through error from the actual handler.

Add hasChainSwitchCandidates pre-check: skip the prompt when
candidateNetworksForFamily or candidateAccountsForFamily is
empty. Original handler then runs and surfaces its own
(more informative) error. Wallets that DO have compatible
networks + accounts still get the chain_switch prompt as
designed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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