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

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 19.2.6
- [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/v19.2.6/packages/react)

Updates `@types/react` from 18.3.27 to 19.2.15
- [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: 19.2.6
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: "@types/react"
  dependency-version: 19.2.15
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -17,15 +17,15 @@
     "lucide-react": "^0.460.0",
     "mermaid": "^11.15.0",
     "papaparse": "^5.5.3",
-    "react": "^18.3.1",
+    "react": "^19.2.6",
     "react-dom": "^18.3.1",
     "react-markdown": "^10.1.0",
     "react-router-dom": "^7.13.0",
     "remark-gfm": "^4.0.1",
     "terser": "^5.46.0"
   },
   "devDependencies": {
-    "@types/react": "^18.3.12",
+    "@types/react": "^19.2.15",
     "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",