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/eslint.config.js

@@ -19,6 +19,18 @@ export default [
   {
     // Behaviour modules run in the browser.
     files: ['src/scripts/**/*.ts'],
-    languageOptions: { globals: { window: 'readonly', document: 'readonly', localStorage: 'readonly' } },
+    languageOptions: {
+      globals: {
+        window: 'readonly',
+        document: 'readonly',
+        localStorage: 'readonly',
+        navigator: 'readonly',
+      },
+    },
+  },
+  {
+    // Node config files.
+    files: ['*.config.{js,mjs,ts}'],
+    languageOptions: { globals: { process: 'readonly', URL: 'readonly' } },
   },
 ];