* Change in-app links to keep you in-app

* refactor Permalink into Link

* rewrite link hrefs in status content

* please linter

* please linter again

* Fix incorrect use of old WebUI paths

PR #16171 renamed some routes but missed some occurrences.
Without #16772, this leads to unreachable routes in those cases.

* Fix floating action button being displayed on statuses and compose screen

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

* Freeze scroll position when a dropdown menu is open in the TL

* Apply this to direct TL as well

* Fix case when mouse leaves the menu

* Make the area to the left “Show Thread” also expand the toot in Web UI

* Clicking the left part of a conversation with the avatars now opens it in Web UI

Fix #11414, fix #9860, fix #10434

Fix #9096

* Add conversations API

* Add web UI for conversations

* Add test for conversations API

* Add tests for ConversationAccount

* Improve web UI

* Rename ConversationAccount to AccountConversation

* Remove conversations on block and mute

* Change last_status_id to be a denormalization of status_ids

* Add optimistic locking