fix: update React/Next.js to patch critical security vulnerability

Updates vulnerable versions of React and/or Next.js to address critical
security vulnerability in React Server Components.

See: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components

Packages updated:
- react: 19.1.0 → 19.1.2
- react-dom: updated to 19.1.2 (compatibility)

Author: dennishenry

package-lock.json

@@ -74,8 +74,8 @@
     "oidc-provider": "^8.8.1",
     "prettier": "^2.8.1",
     "pretty-quick": "^3.1.3",
-    "react": "19.1.0",
-    "react-dom": "19.1.0",
+    "react": "^19.1.2",
+    "react-dom": "^19.1.2",
     "rollup": "^3.7.0",
     "rollup-plugin-analyzer": "^4.0.0",
     "rollup-plugin-delete": "^2.0.0",