A scheduled post

Scheduled posts should work here, including across ATproto and ActivityPub! We did distribution a little differently, so it was easier to implement.

This is indeed a test of that – it should go out at 11:30am Eastern. We'll see if it works!

edit: this also found another silly logic bug with Scheduled posts. But that's fixed now, and we got times in our timezone instead of UTC now.

...also, the Publish now button is a little confusing working on Scheduled posts. Behind the scenes, we save posts as Draft with future published date. So technically all the automatic saves are updating this “Draft” post, and it will go out exactly as the last Draft is when the time comes. You could be middle of sentence or something. And then my instinct is to click something when I'm done editing, just to be sure it's saved. (Maybe “Save draft” becomes “Save scheduled post”? –no, that literally reverts it to a Draft, so you have to keep clicking “Schedule”. Ugh.)

So I probably need to change all that behavior eventually. But we'll test the basics for now.