fix(ada): providing unsigned sweep support for WRW

[dgm003]

Ticket: CSHLD-134

Description

Extends the ADA unsigned sweep (cold wallet recovery) flow to correctly handle token-holding wallets.

Two gaps existed in the unsigned sweep path:

1. 'explainTransaction()' stripped 'multiAssets' from outputs — token info was never surfaced in the parsed/explained view
2. 'recover()' function unsigned path only used parsedTx.outputs[0], so token transactions with 2 outputs were broken

Changes:

• transaction.ts: Added extractTokenTransfers() helper that converts CardanoWasm.MultiAsset into a flat '{ policyId, assetName, quantity }' array. Updated 'explainTransaction()' return type and output mapping to include 'tokenTransfers?' per output.
• ada.ts: Fixed recover() unsigned sweep path to map over all 'parsedTx.outputs' instead of hardcoding only 'outputs[0]', with 'tokenTransfers' passed through.
• ada.ts test: Added test for unsigned sweep with ADA+Token UTXOs — asserts 2 inputs, 2 outputs, correct token amounts, and tokenTransfers populated in explainTransaction().

Issue Number

CSHLD-134

Type of change

Bug fix (non-breaking change which fixes an issue)
New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Ran npx mocha test file

• All 160 existing unit tests pass
• New unit test added: 'should recover ADA plus token UTXOs - token and ADA both appear in outputs (unsigned sweep)'
• Validates 2 inputs (ADA UTXO + token UTXO), 2 outputs (token output with correct MultiAsset + ADA remainder), and 'tokenTransfers' in 'explainTransaction()'