Depends on D4939
Context: [[ https://linear.app/comm/issue/ENG-1463/show-pending-thread-in-web-inbox-when-create-chat-is-pressed | here ]]
Changing behaviour after closing `ChatThreadComposer`.
Now, when we close thread composer on pending thread by clicking the `X` button, app will focus on the first thread on the top of the list
In other cases, app will focus on the currently generated or matched thread.