Change Details

[Part of ENG-1988](https://linear.app/comm/issue/ENG-1988) This diff modifies `website-responders.js` to update the `userStore` when you navigate to a thread composer (`/chat/thread/new/<user-id>`), by updating the relationship between the users.

[Part of ENG-1988](https://linear.app/comm/issue/ENG-1988) This diff modifies `website-responders.js` to update the `userStore` when you navigate to a thread composer with users that you don't have in the `userStore`. (`/chat/thread/new/<user-id-not-in-user-store>`), by updating the relationship between the users.

[Part of ENG-1988](https://linear.app/comm/issue/ENG-1988) This diff modifies `website-responders.js` to update the `userStore` when you navigate to a thread composer with users that you don't have in the `userStore`. (`/chat/thread/new/<user-id>`-not-in-user-store>`), by updating the relationship between the users.