test: vitest unit + playwright e2e suites; fix a11y, contrast, no-JS reveal

- vitest: dictionary parity, slug-map bijection, content-schema validation, JSON-LD (23)
- playwright: both locales, language-switch mapping (incl. no-JS), CV downloads,
  form happy-path + honeypot, axe a11y on 5 templates x 2 themes (23)
- fix: raise ink-faint + light accent to meet WCAG AA 4.5:1 (axe-verified)
- fix: gate reveal animations behind html.js so content is visible without JS
  (progressive enhancement - was hidden at opacity 0); scan reduced-motion path
- fix: validate contact form before the anti-bot time-trap (no false success)
- chore: ESLint node globals, typed diagram props, resvg fontFiles, prettier pass

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

site/src/components/pages/AboutPage.astro

@@ -19,9 +19,13 @@ const m = getMeta('about', locale);
   <div class="mx-auto grid max-w-[--content-max] gap-12 px-6 py-14 lg:grid-cols-12">
     <div class="lg:col-span-7">
       <SectionLabel text={d.nav.about} />
-      <h1 class="mt-4 text-h1">{profile.aboutHeading}</h1>
+      <h1 class="text-h1 mt-4">{profile.aboutHeading}</h1>
       <div class="mt-6 flex flex-col gap-4">
-        {profile.aboutParagraphs.map((para) => <p class="max-w-[64ch] text-body-lg text-ink-muted">{para}</p>)}
+        {
+          profile.aboutParagraphs.map((para) => (
+            <p class="text-body-lg text-ink-muted max-w-[64ch]">{para}</p>
+          ))
+        }
       </div>
       <p class="mt-8">
         <span class="mono-label mb-2 block">{d.about.interests}</span>