htmleditor.page previously used hardcoded blue/gray Windows-95-era
inline styles (#678, #abc, #808080, #def) totally disconnected from
the site current dark/gold Bond theme (main.css --bond-* variables) -
this is what showed up as "the old page with the blue stylesheet"
when opening a file to edit. Restyled the window chrome, toolbar,
title bar, and buttons to use the same custom properties/.button
class the rest of the site uses; left the #mainpage content-preview
canvas white since it renders the actual page being edited.
email.js: removed the Disconnect button/handler and its unused icon
from the email toolbar per request. Bumped its cache-buster in
admin-email.subpage.