A site allowed without "Remember" lives only in the background's
in-memory connectedSites map. Settings never listed it, and
AUTISTMASK_REMOVE_SITE, sent on every remove, did nothing, so the user
could not end such a connection.
Settings now asks the background for those sites and lists them under
Connected Sites. Removing a site from Allowed Sites or Connected Sites
drops its remembered entry under every address and sends
AUTISTMASK_REMOVE_SITE with the hostname; the background deletes every
matching connectedSites entry and sends accountsChanged with an empty
list to the site's tabs. Only the extension's own pages may send either
message.
Model: opus-5-5