Non-markdown tags weren't being escaped in chat excerpts. This could be
triggered by editing a chat message containing a tag (self XSS), or by
replying to a chat message with a tag (XSS).
Co-authored-by: Jan Cernik <jancernik12@gmail.com>
The old choose-topic component did not have the same style as the rest
of the create invite modal and was not very suitable to use in the modal
because it introduced the search results in modal's body.
The new topic-chooser is built using select-kit and provides a more
polished user experience.
