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 19.2.0
- [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/v19.2.0/packages/react)

Updates `@types/react` from 18.3.23 to 19.2.2
- [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: 19.2.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/react"
  dependency-version: 19.2.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -37,7 +37,7 @@
     "katex": "^0.16.22",
     "msw": "^2.3.5",
     "query-string": "^9.1.0",
-    "react": "^18.3.1",
+    "react": "^19.2.0",
     "react-dom": "^18.3.1",
     "react-dropzone": "^14.3.5",
     "react-hook-form": "^7.53.0",
@@ -74,7 +74,7 @@
     "@testing-library/react": "16.3.0",
     "@testing-library/user-event": "14.6.1",
     "@types/node": "24.0.13",
-    "@types/react": "18.3.23",
+    "@types/react": "19.2.7",
     "@types/react-dom": "18.3.7",
     "@types/react-speech-recognition": "^3.9.6",
     "@types/react-syntax-highlighter": "15.5.13",