giles 32fd3ef7d3 Add SSR/hydration flash detection test, fix to-number → parse-number ...

- site-full.spec.js: home test captures SSR counter from raw HTML before
  JS runs, compares with post-hydration counter. Fails if they differ.
- home-stepper.sx: to-number → parse-number (to-number doesn't exist
  in the OCaml server environment — caused crash on fresh server start)

Test output: "No flash: SSR=0 hydrated=0" — passes.
Tested on fresh stack=site server, not cached Docker container.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-10 07:22:25 +00:00

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