chore(deps): bump react and @types/react in /frontend

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) and [@types/react](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react). These dependencies needed to be updated together.

Updates `react` from 18.3.1 to 19.2.3
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/main/CHANGELOG.md)
- [Commits](https://github.com/facebook/react/commits/v19.2.3/packages/react)

Updates `@types/react` from 18.3.27 to 19.2.8
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react)

---
updated-dependencies:
- dependency-name: react
  dependency-version: 19.2.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/react"
  dependency-version: 19.2.8
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -25,7 +25,7 @@
     "framer-motion": "^12.24.0",
     "lucide-react": "^0.554.0",
     "next-themes": "^0.4.6",
-    "react": "^18.2.0",
+    "react": "^19.2.3",
     "react-dom": "^18.2.0",
     "react-router-dom": "^7.12.0",
     "react-syntax-highlighter": "^16.1.0",
@@ -35,7 +35,7 @@
     "tailwindcss-animate": "^1.0.7"
   },
   "devDependencies": {
-    "@types/react": "^18.2.43",
+    "@types/react": "^19.2.8",
     "@types/react-dom": "^18.2.17",
     "@vitejs/plugin-react": "^4.7.0",
     "autoprefixer": "^10.4.16",