The diff extends `navInfo` object with new tab `chat-creation`, and new field - `selectedUserList` containing list of users read from URL.
The aim is to keep URL while creating (or finding existing) thread look like `/chat/thread/new/<list_of_added_users_separated_by_comma>`.
So for example `/chat/thread/new/1,7,48/` is going to redirect user to chat creation screen with selected three users with IDs 1,7 and 48.
Empty list will create URL look like `/chat/thread/new/`