Change Details

**PLEASE NOTE THAT THIS DIFF AND SUBSEQUENT DIFFS IN THIS STACK WILL NOT BE LANDED UNTIL MORE OF THE REDESIGN IS READY SINCE THIS WILL CAUSE REGRESSIONS IN PROD** This diff updates the chat thread composer ui to match the ui in the new web app redesign. Linear task: https://linear.app/comm/issue/ENG-5936/message-list-ui-redesign Depends on D10549

**PLEASE NOTE THAT THIS DIFF AND SUBSEQUENT DIFFS IN THIS STACK WILL NOT BE LANDED UNTIL MORE OF THE REDESIGN IS READY SINCE THIS WILL CAUSE REGRESSIONS IN PROD** This diff updates the chat thread composer ui to match the ui in the new web app redesign. In this diff I did the following: - Added a bottom border inset to the search container when a user is selected - Added a border radius to the hover effect Linear task: https://linear.app/comm/issue/ENG-5936/message-list-ui-redesign Depends on D10549

**PLEASE NOTE THAT THIS DIFF AND SUBSEQUENT DIFFS IN THIS STACK WILL NOT BE LANDED UNTIL MORE OF THE REDESIGN IS READY SINCE THIS WILL CAUSE REGRESSIONS IN PROD** This diff updates the chat thread composer ui to match the ui in the new web app redesign. In this diff I did the following: - Added a bottom border inset to the search container when a user is selected - Added a border radius to the hover effect Linear task: https://linear.app/comm/issue/ENG-5936/message-list-ui-redesign Depends on D10549