Highlight unread (new) posts in thread

Highlight unread (new) posts in thread or add an cion whatever to se what is new and unread by a user. Now you can see only "X unread posts" in the right panel, but thats all. What about to jump to the first unread post?

Start with the thread's right panel, which currently shows only "X unread posts," and reproduce the unread-post flow. Clarify whether the intended result is highlighting, an icon, jumping to the first unread post, or a combination; done should make the chosen unread-post behavior visible and testable.

Written by the indexing model from the issue text.