Work chat login support (enable the "work" setting to use it)

This covers three autodetected login types:

1. Work account password

   Simple, very similar to normal account types

2. Linked personal account

   This is deprecated but still needed in some companies. Looks just
   like password auth to users. In rare cases there may be more than
   one work account linked to a personal account, in which case this
   will only use the first one. Usually they can be de-linked by
   assigning a password (see the official docs)

3. SSO

   This one is awkward. The password can be set to garbage and users
   will receive a PM with instructions to do an oauth-like login,
   but there's no explicit auth code screen, just a redirect to a
   fb-workchat-sso://, which probably results in an error. Users are
   expected to copy that url, hopefully from the address bar.
   Not very practical, but works!

In all cases, the username is the work account email.

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