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/ProjectsIndexPage.astro

@@ -17,8 +17,8 @@ const m = getMeta('projects', locale);
 <Base locale={locale} pageId="projects" title={m.title} description={m.description}>
   <div class="mx-auto max-w-[--content-max] px-6 pt-14">
     <SectionLabel text={d.home.projectsLabel} />
-    <h1 class="mt-4 text-h1">{d.home.projectsHeading}</h1>
-    <p class="mt-4 max-w-[62ch] text-body-lg text-ink-muted">{m.description}</p>
+    <h1 class="text-h1 mt-4">{d.home.projectsHeading}</h1>
+    <p class="text-body-lg text-ink-muted mt-4 max-w-[62ch]">{m.description}</p>
   </div>
   <div class="mt-10">
     <ProjectCards locale={locale} header={false} />