checkRecipientHistory() showed the warning boxes whenever its lookups
answered, so after Back and a review to another recipient, a late answer
about the first recipient could show the never-sent-a-transaction, contract
or Etherscan phishing box on the second recipient's screen. It now drops a
result for a transaction no longer on screen, as estimateGas() and
readBalances() already do.
tests/confirmTxLateResult.test.js holds back the first screen's answer until
the second screen is shown, for each of the three boxes, the balance read and
the fee estimate.
Model: opus-5-5
sneak