Allow users to change "Activity Summary" frequency when clicking through from emails

Thanks for making this change, Neil!

I’m wondering, though, why you didn’t elect to add the “email settings” option to the other footers?

As for @tophee’s question: I’m torn. It would be nice to offer a “halfway house” UI that’s less busy than the default settings. On the other hand, users will likely need to deal with those settings eventually and it might be more confusing to have two sets of UIs (one of which is only accessible via email).

How about, when linking to the email settings, we could highlight the relevant settings. Something like this: