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 18.3.20 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: "@types/react"
  dependency-version: 19.2.15
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: react
  dependency-version: 19.2.6
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -18,7 +18,7 @@
         "jp-local-gov": "^1.8.0",
         "next": "^16.2.4",
         "plotly.js-dist-min": "^3.5.1",
-        "react": "^18.3.1",
+        "react": "^19.2.6",
         "react-dom": "^18.3.1",
         "react-icons": "^5.6.0",
         "react-plotly.js": "^2.6.0",
@@ -38,7 +38,7 @@
         "@types/mdx-js__react": "^1.5.8",
         "@types/node": "25.6.0",
         "@types/plotly.js-dist-min": "^2.3.4",
-        "@types/react": "^18.3.11",
+        "@types/react": "^19.2.15",
         "@types/react-dom": "18.3.0",
         "@types/react-plotly.js": "^2.6.4",
         "@types/react-world-flags": "^1.6.0",