feat(a11y): implement screen reader support and accessibility optimizations

package.json

@@ -68,10 +68,13 @@
     "husky": "^9.1.7",
     "lint-staged": "^16.2.7",
     "lucide-react": "^0.563.0",
+    "pa11y-ci": "^4.0.1",
     "postcss": "^8.5.6",
     "prettier": "^3.8.1",
+    "puppeteer": "^24.37.3",
     "remotion": "^4.0.421",
     "sass": "^1.97.1",
+    "start-server-and-test": "^2.1.3",
     "tailwindcss": "^4.1.18",
     "tsx": "^4.21.0",
     "typescript": "^5.7.2",
@@ -89,6 +92,7 @@
     "test:og": "vitest run tests/og-image.test.ts",
     "check:og": "tsx scripts/check-og-images.ts",
     "check:mdx": "node scripts/validate-mdx.mjs",
+    "check:a11y": "start-server-and-test start http://localhost:3000 'pa11y-ci'",
     "cms:branding:local": "DIRECTUS_URL=${DIRECTUS_URL:-http://cms.klz.localhost} npx tsx --env-file=.env scripts/setup-directus-branding.ts",
     "cms:branding:testing": "DIRECTUS_URL=https://cms.testing.klz-cables.com npx tsx --env-file=.env scripts/setup-directus-branding.ts",
     "cms:branding:staging": "DIRECTUS_URL=https://cms.staging.klz-cables.com npx tsx --env-file=.env scripts/setup-directus-branding.ts",