The Docker build 404'd on @types/react@19.2.17 (not in the Nexus mirror; npmjs
is blocked upstream). Pin shared deps to the exact versions the main app uses
(@types/react 19.2.16, etc.) and regenerate package-lock.json against the Nexus
registry so every resolved tarball is one Nexus can serve.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>