fix(security): add DOMPurify dependency

Author: riddhimagupta2

package-lock.json

@@ -27,6 +27,7 @@
     "@resvg/resvg-js": "^2.6.2",
     "@tailwindcss/postcss": "^4.2.2",
     "@vercel/analytics": "^1.6.1",
+    "dompurify": "^3.4.7",
     "framer-motion": "^12.38.0",
     "html-to-image": "^1.11.13",
     "lucide-react": "^1.8.0",
@@ -44,6 +45,7 @@
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",
     "@testing-library/user-event": "^14.6.1",
+    "@types/dompurify": "^3.0.5",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",