Bump the react group across 1 directory with 2 updates

Bumps the react group with 2 updates in the / directory: [react](https://github.com/facebook/react/tree/HEAD/packages/react) and [react-dom](https://github.com/facebook/react/tree/HEAD/packages/react-dom).


Updates `react` from 19.2.5 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 `react-dom` from 19.2.5 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-dom)

---
updated-dependencies:
- dependency-name: react
  dependency-version: 19.2.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: react
- dependency-name: react-dom
  dependency-version: 19.2.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: react
...

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

frontend/package.json

@@ -26,8 +26,8 @@
     "@tonejs/midi": "^2.0.6",
     "mitt": "^3.0.1",
     "pixi.js": "^8.0.0",
-    "react": "^19.0.0",
-    "react-dom": "^19.0.0",
+    "react": "^19.2.6",
+    "react-dom": "^19.2.6",
     "smplr": "^0.14.0",
     "tone": "^15.0.4",
     "webmidi": "^3.1.11",