giles 79ba9c2d40 Fix stepper SSR/hydration flash: server reads cookie, cache bypass ...

Three changes to eliminate the stepper flash:

1. home-stepper.sx: server path reads cookie via (get-cookie) for
   step-idx initial value. Client path reads document.cookie via
   def-store. Both default to 0 when no cookie exists.

2. sx_server.ml: bypass response cache when sx-home-stepper cookie
   is present. Render on main thread (not worker) so get-cookie
   sees the parsed request cookies.

3. site-full.spec.js: flash detection test sets cookie=7 via
   Playwright context, checks SSR HTML matches hydrated state.

Test: "No flash: SSR=7 hydrated=7 (cookie=7)" — passes.
Tested on fresh stack=site server subprocess.

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

2026-04-10 07:28:47 +00:00

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