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Turnstile logs two NaN console errors on /sign-in, /sign-up and /payment-demo in production #470

Description

@TortoiseWolfe

Live production logs two console errors on every route that mounts Cloudflare Turnstile:

%c%d font-size:0;color:transparent NaN     (x2)

Confirmed on scripthammer.com at 134f94e:

route console errors mounts Turnstile
/sign-in/ 2 yes
/sign-up/ 2 yes
/payment-demo/ 2 yes
/, /contact/, /blog/, /docs/, /status/, /privacy/, /cookies/, /comment-policy/, /accessibility/, /privacy-controls/ 0 no

Perfectly correlated with Turnstile and nothing else, so it is very likely the widget's own instrumentation rather than app code. Worth confirming rather than assuming: %c%d with a NaN argument means something is formatting an undefined number, and if that turns out to be ours it is a real bug with a trivial fix.

Two credential pages and the payment demo are not where you want unexplained console noise, and it makes a console-based smoke check noisier for everyone who comes after.

Why this is filed separately

It was originally one half of #466, whose other half — a React #418 hydration mismatch on /contact — is fixed and verified on production. Closing #466 for that fix would have closed this finding with it, leaving a resolved issue whose body still described an unresolved problem. That is the failure mode CLAUDE.md's issue-hygiene section is about, so the surviving half gets its own ticket.

How to check

docker compose exec -T scripthammer node .pay-verify/prodcheck.mjs   # render gate, exit 0

then load /sign-in/ with a console listener — .pay-verify/prod.mjs already prints per-route console errors. Note the container cannot resolve scripthammer.com (WSL2 resolver); Chromium needs --host-resolver-rules=MAP scripthammer.com 185.199.108.153.

Related: #442 (Turnstile is live on those forms with no privacy-policy disclosure, which blocks the remaining half of #374).

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