fix(transactions): expose tx identifier under both hash and txId

[MuncleUscles]

Summary

The same on-chain identifier was exposed under different field names depending on which decoder ran:

• decodeLocalnetTransaction (Studio) only set hash
• decodeTransaction (testnet) only set txId

This broke any consumer that didn't know which one to read — e.g. genlayer-studio's transactions store kept polling but couldn't match the response back to the in-memory entry, leaving the UI stuck on PENDING on Bradbury.

Both decoders now populate both fields. txId matches the on-chain Solidity struct (source of truth); hash is preserved for back-compat with the legacy localnet RPC shape. The pre-existing // TODO: make localnet compatible with testnet and unify the types comment in types/transactions.ts is replaced with a clarifying note.

Test plan

• npm test -- --run passes (54 tests)
• New unit test asserts both fields populated by decodeTransaction
• Verified end-to-end with genlayer-studio polling on Bradbury (tx 0x663cf5f0... advances PENDING -> ACCEPTED)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c98a8266-bc78-45dd-b712-418b97a26df2

📥 Commits

Reviewing files that changed from the base of the PR and between 66a1d03 and 1c31b91.

📒 Files selected for processing (3)

• src/transactions/decoders.ts
• src/types/transactions.ts
• tests/transactions.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/unify-tx-hash-and-txid

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