Restore Next.js 16.1.0 and update snapshots. The dev-server test
flakiness will be investigated separately.
- next: ^16.1.0
- next-auth: 5.0.0-beta.30
- react: ^19.2.3
- react-dom: ^19.2.3
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>