Suppress false Reserve Approve/Swap failures on Celo nonce preflight exceptions

[Copilot]

Reserve swaps on Celo were surfacing an error modal before wallet signature (Approve transaction failed / Swap transaction failed) even when the transaction later completed successfully. The UI was treating a transient preflight CALL_EXCEPTION on method="nonce()" as a terminal tx failure.

• Problem scope

  • Error modal shown too early in Reserve swap flow on Celo.
  • False negative UX: failure displayed, then MetaMask signing + on-chain tx still succeeds.

• UI error handling update (mentoReserve.tsx)

  • Added a narrow guard for preflight nonce-call exceptions:
    • matches CALL_EXCEPTION
    • matches method="nonce()"
  • Applied guard to both approve.state.status === 'Exception' and swap.state.status === 'Exception'.
  • Existing error modal behavior is unchanged for all other exception types.

• Behavioral impact

  • Suppresses misleading pre-signature errors specific to transient nonce preflight calls.
  • Preserves user-visible failures for real approve/swap exceptions.

const NONCE_METHOD_REGEX = /method\s*=\s*"nonce\(\)"/i
const CALL_EXCEPTION_REGEX = /call_exception/i

const isSwapPreflightNonceException = Boolean(
  swap?.state?.errorMessage &&
    CALL_EXCEPTION_REGEX.test(swap.state.errorMessage) &&
    NONCE_METHOD_REGEX.test(swap.state.errorMessage)
)

if (swap?.state?.status === 'Exception' && !isSwapPreflightNonceException) {
  setError({
    message: i18n._(t`Swap transaction failed, please try again.`),
    reason: decodeTransactionErrorReason(swap.state.errorMessage),
  })
}

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[JHON12091986]

I'd like to work on this bounty. I have experience with React and UI/UX. I'll fix the error display so it only shows when the transaction actually fails, not when it completes successfully.

ETA: 1-2 days.