* PLT-6486 Add an `@username` button to the profile popover, that puts the username in the post when clicked
* PLT-6486 Display `@username` mention on the right text area on center or RHS.
* Disable @mentions from profile popover on searches, mentions and pinned posts. Fix js errors.
* Control undefined post in SearchStore that causes an exception.
* Major post list refactor
* Fix post and thread deletion
* Fix preferences not selecting correctly
* Fix military time displaying
* Fix UP key for editing posts
* Fix ESLint error
* Various fixes and updates per feedback
* Fix for permalink view
* Revert to old scrolling method and various fixes
* Add floating timestamp, new message indicator, scroll arrows
* Update post loading for focus mode and add visibility limit
* Fix pinning posts and a react warning
* Add loading UI updates from Asaad
* Fix refreshing loop
* Temporarily bump post visibility limit
* Update infinite scrolling
* Remove infinite scrolling
