Hide & mark a post as read without voting on it

A few people have been voting on everything they see in order to mark it as read and remove it from their feed. This doesn't work great now that there's a vote quota because after a while they use up their quota and can't treat their feed like an inbox anymore.

To accommodate this workflow I've added a new button which does the thing without also recording it as a vote. Also the teaser is instantly hidden which brings the teasers below that up into it's place - less scrolling!

This is only visible for people with the "Do not display posts with which I have already interacted (opened/upvoted/downvoted)" setting enabled.