ListAddRemoveUsers: add profile links, hovercards, and new search

[leonlarsson]

I was annoyed that I could not peek at profiles in the user list modal, so this PR aims to fix that

• Adds a ProfileHoverCard and Link around the avatar
• Adds the <FollowsYou /> pill below the handle (not shown in video)
• Replaces TextInput with SearchInput
• Only shows "No results found for {query}" if there is a query

Preview: