feat: show partial replies count/reply-ability in reply button

https://witchsky.app/profile/xan.lol/post/3mkp4e6ppf22u

if a post has one, two, or three replies, it should get the respective number of dots in the reply icon. for more than 3 replies, it should still have 3 dots.

if a post is thread gated and the logged in user wouldn't be able to reply, give it a lock icon. if replies are disabled, put an ✘ in it.