feat(contact-us): Add hCaptcha verification to contact form

- Install @hcaptcha/react-hcaptcha dependency for CAPTCHA protection
- Add hCaptcha component integration with site key configuration
- Implement captcha token state management with verification callbacks
- Add token validation before form submission with user feedback
- Reset captcha after successful form submission
- Include captcha in form submission payload as hcaptcha_token
- Update Next.js to version 15.5.7 for compatibility
- Enhance form security by requiring CAPTCHA verification before contact submission

package.json

@@ -8,13 +8,14 @@
     "start": "next start"
   },
   "dependencies": {
+    "@hcaptcha/react-hcaptcha": "^1.16.0",
     "@tanstack/react-query": "^5.90.7",
     "@types/dompurify": "^3.2.0",
     "apexcharts": "^5.3.5",
     "axios": "^1.12.2",
     "dompurify": "^3.3.0",
     "firebase": "^12.6.0",
-    "next": "15.5.5",
+    "next": "^15.5.7",
     "react": "19.1.0",
     "react-apexcharts": "^1.8.0",
     "react-dom": "19.1.0",