An expired session failed the /_api/ws/editor handshake exactly like a dead
network, so the page/banner editors retried forever — the WS API cannot
open the login dialog. reconnect.js gains authReconnect(): on close, probe
/_api/settings (dialog-less fetchJson); a 401/403 runs the paskia login
flow and reconnects the moment it completes, a declined login holds at a
'session expired' ConnNote, and only transient failures take the paced
backoff. A paskia auth-success message from anywhere in the page
reconnects a waiting editor at once. AnalyticsView moves from its inline
copy of the same flow onto the shared helper.