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/package.json

@@ -28,17 +28,18 @@
     "sharp": "^0.33.5"
   },
   "devDependencies": {
+    "@astrojs/check": "^0.9.4",
     "@eslint/js": "^9.20.0",
     "@tailwindcss/vite": "^4.0.6",
     "@types/node": "^22.13.1",
     "eslint": "^9.20.1",
     "eslint-plugin-astro": "^1.3.1",
-    "typescript-eslint": "^8.24.0",
     "prettier": "^3.5.1",
     "prettier-plugin-astro": "^0.14.1",
     "prettier-plugin-tailwindcss": "^0.6.11",
     "tailwindcss": "^4.0.6",
     "typescript": "^5.7.3",
+    "typescript-eslint": "^8.24.0",
     "vitest": "^3.0.5"
   }
 }