build(deps): bump react from 18.3.1 to 19.0.0 in /small-angle-demo

Bumps [react](https://github.com/facebook/react/tree/HEAD/packages/react) from 18.3.1 to 19.0.0.
- [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/v19.0.0/packages/react)

---
updated-dependencies:
- dependency-name: react
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

small-angle-demo/package.json

@@ -30,7 +30,7 @@
     "mathjax-full": "^3.1.2",
     "mathjax-react": "^2.0.1",
     "pixi.js": "~6.5.1",
-    "react": "^18.2.0",
+    "react": "^19.0.0",
     "react-dom": "^18.2.0",
     "react-range-step-input": "github:ccnmtl/react-range-step-input"
   },