feat: add multisig transaction signature audit

[cc-unchained]

What kind of change does this PR introduce?

Adds a signature audit tool under Wallet → Transactions that determines which quorum key produced each
signature in a finalized multisig transaction.

The tool:

• Accepts either a transaction ID or raw transaction hex
• Supports P2SH, P2SH-P2WSH, and P2WSH multisig inputs
• Cryptographically verifies signatures against the public keys in each input’s redeem or witness script
• Uses the loaded wallet configuration to show the signer name, root fingerprint, derivation path, public
  key, and signature
• Fetches previous-output amounts through the configured blockchain client when required for SegWit
  verification

Issue Number:

Fixes #

Snapshots/Videos:

If relevant, did you update the documentation?

Summary

Does this PR introduce a breaking change?

Checklist

• I have tested my changes thoroughly.
• I have added or updated tests to cover my changes (if applicable).
• I have verified that test coverage meets or exceeds 95% (if applicable).
• I have run the test suite locally, and all tests pass.
• I have written tests for all new changes/features
• I have followed the project's coding style and conventions.
• I have created a changeset to document my changes (npm run changeset)

Other information

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[changeset-bot]

🦋 Changeset detected

Latest commit: 644d487

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@caravan/transactions	Minor
caravan-coordinator	Minor

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Project	Deployment	Actions	Updated (UTC)
caravan-coordinator	Ready	Preview, Comment	Jul 15, 2026 8:46pm

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