Convenience features for conversations

Hey anons, we added some features: if you mouse over post references, you'll see a copy of the post pop up so you can see which it is and read it without having to navigate to it. Also, (you) and (op) are appended to references as appropriate. A few other minor things not worth mentioning.

Tag lists on threads are now sorted by size reflecting their increasingly viable interpretation as a "path". Meanwhile the progress on the intelligent auto-tagging system continues. It's working and now fast, but still needs to be taken off the critical path of page loads.

We'll keep shipping more stuff this week. The big goal we're working up to is the site being "growth ready", which is when we switch from trying to make it feature complete and robust to putting more work into driving conversation and getting everybody on here. That will probably be more exciting for you guys, but we've had a lot of foundational work to do first!

When you click ✅ on a post, the score used to increment right away. Now it stays the same. Old way was more satisfying.

Mouseover feature feels great, congrats