[Enhancement]: "Add to Collections" should work similarly to metadata fields

[sydlexius]

Describe the feature/enhancement

It would be nice if collection membership could be managed from "Edit" screen. Further still, it would be nice if collections could be auto-completed similar to author or tag names.

[kuldan5853]

While we're at this - would it make sense to be able to add series to collections too, not only individual books?

[Xurbax]

I was very surprised to find that you could not add an entire Series to a Collection! I want to use Collections essentially as "genre" tagging, and therefore almost always an entire Series belongs in one Collection.

[t0maz]

Coming back to the enhancment from the first post, a +1 from me. It would be nice feature which would also help with lack of filtering in current "Add to collection" UI.