Is the Detail component only coming in 13 Final or do you have to do something special to include it in 13 beta1?
Yes, according to the [roadmap]
(https://github.com/orgs/vaadin/projects/1), a Details
component (backed by a vaadin-details
Web Component) is coming with Vaadin 13. It looks like it wasn’t shiped with 13.0.0.beta1
but it is in 13.0.0.beta2
.