Evaluate whether entering deckbuilder should navigate to card listing

[onecrayon]

I didn't do this originally, because I like the idea of starting to edit a deck and immediately being able to add whatever cards grabbed your fancy in your current context. However, multiple people have been confused about how to add cards to a deck, so there's clearly a UX problem here (or it might be an overwhelmingly common use-case).

Once decks are published, I need to poll folks to see how people are using the deckbuilder and evaluate whether it should automatically open the card browser.

[Suitch]

I felt similar confusion, especially on mobile.