Improve user following interaction #476

When following a user - clicking the "follow" button on a user profile - there is a noticeable delay of more than 1 second before the "follow" text changes to "followed". Additionally, the follower count does not increase until the page is reloaded (fetching the follower graph again after someone follows a user is unnecessary, but the count could simply be increased by one client-side temporarily). See recording of interaction at https://bsky.app/profile/uncenter.dev/post/3ljkiqnzim22u if necessary.