chore(deps)(deps): bump react-resizable-panels in /frontend/app

Bumps [react-resizable-panels](https://github.com/bvaughn/react-resizable-panels) from 4.8.0 to 4.9.0.
- [Release notes](https://github.com/bvaughn/react-resizable-panels/releases)
- [Changelog](https://github.com/bvaughn/react-resizable-panels/blob/main/CHANGELOG.md)
- [Commits](bvaughn/react-resizable-panels@4.8.0...4.9.0)

---
updated-dependencies:
- dependency-name: react-resizable-panels
  dependency-version: 4.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

frontend/app/package.json

@@ -54,7 +54,7 @@
     "react-day-picker": "^9.14.0",
     "react-dom": "^19.2.4",
     "react-hook-form": "^7.72.1",
-    "react-resizable-panels": "^4.8.0",
+    "react-resizable-panels": "^4.9.0",
     "react-router": "^7.14.0",
     "recharts": "^3.8.1",
     "sonner": "^2.0.7",