fix(sdk): stop signature step polling on failure or refund

[erkancamli]

In signatureStep.ts status polling, a failure throws Error(res.data.details || 'Transaction failed'), but the catch only rethrows messages containing "Transaction failed" or "Failed to check". Any other details string is treated as a network error and retried until maxAttempts, and then surfaces as Failed to get an ok response after N attempt(s), losing the real reason. refund, which /intents/status/v3 can return, has no branch at all, so it also polls until the timeout.

transaction.ts and the websocket handlers already treat both as final (Transaction failed: Refunded). With websocket off by default, every signature based quote with a check endpoint goes through this polling path.

The change adds a small CheckStatusError that failure and a new refund branch throw and the catch rethrows. Request errors, including 4xx such as 429, are still retried as before. A refund now marks the step as refunded like the other paths do.

Tests: three cases in signatureStep.test.ts. The failure with details and the refund cases fail on main (got 'Failed to get an ok response after 5 …') and pass now; the third confirms request errors are still retried. pnpm typecheck passes. The rest of the sdk suite passes except client.test.ts > Should configure chains dynamically, which calls the live chains API and fails the same way on main in my environment (no outbound access to it).

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[greptile-apps]

Confidence Score: 5/5

[Medium risk] Changes signature transaction polling behavior on failure.

The PR appears safe to merge; the previously reported stale refund status is fixed.

Summary

The PR stops signature-step polling when the status check reports failure or refund, preserves failure details, and adds polling tests. The refund path now marks the step item as refunded.

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