feat: add color contrast checking script for CI/CD

- Added scripts/check-color-contrast.ts to validate WCAG AA compliance
- Added npm script 'check:contrast' for easy execution
- Validates 7 critical color pairs
- All color combinations now pass WCAG AA 4.5:1 standard

package.json

@@ -10,6 +10,7 @@
     "test": "playwright test",
     "test:smoke": "playwright test --grep @smoke",
     "test:report": "allure generate test-results/allure-results && allure open",
+    "check:contrast": "tsx scripts/check-color-contrast.ts",
     "audit:performance": "node scripts/performance-audit.js",
     "audit:seo": "node scripts/seo-check.js",
     "audit:accessibility": "node scripts/accessibility-test.js",
@@ -47,6 +48,7 @@
     "eslint-config-next": "^0.2.4",
     "lighthouse": "^13.0.3",
     "tailwindcss": "^4",
+    "tsx": "^4.21.0",
     "typescript": "^5"
   }
 }