⬆ Bump @tanstack/react-router from 1.19.1 to 1.125.6 in /frontend

---
updated-dependencies:
- dependency-name: "@tanstack/react-router"
  dependency-version: 1.125.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]