⬆ Bump @tanstack/react-router from 1.19.1 to 1.123.2 in /frontend

---
updated-dependencies:
- dependency-name: "@tanstack/react-router"
  dependency-version: 1.123.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]