log when listpays verification itself errors

When ln.listpays throws inside the post-failure verification path in
sendLightning / sendKeysend, the outer catch was swallowing it silently.
That meant a CLN outage during a failing payment was indistinguishable
from clean failure-and-reverse in the logs.

We still want to not-reverse in this case (the debit stays, pending stays
in the reconciler set, check() retries when CLN is back), but the
operator deserves to know the verification step failed. Logged via
warnThrottled so a multi-hour outage doesn't flood the log.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

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