A tab names the account it was claimed for on every request, beacon and upload
(X-Siftlode-Expect-Account); current_user and /auth/logout refuse a mismatch with
401 account_changed and keep the session, so a tab left showing the account
signed in before reloads instead of writing to the new one.
/auth/login clears a connect marker left by an abandoned connect, and a link
completes only on a session that still holds. The prefs merge reads the row
under a lock. A tab's sessionStorage records its own owner. A page the account
loses is given up, address bar and remembered page included. The panel layouts
are preferences; the storage contract also refuses a key handed to the Storage
API or to usePref outside its kind. A refused sign-in as someone else and a
failed sign-out say so. The chromium-only e2e specs are in the gate register,
the member walk waits for its requests, and devices.spec checks the save itself.
The suite ran only as an admin, so nothing end to end held what a member sees. A second seeded
account, a member with its own session, now walks every rail page (no admin entry, no admin call,
no error state) and follows links to the admin pages.
It found one: a member's link to an admin page showed the feed with no rail row current, and the
address bar kept naming the admin page — only the content fell back. The navigation state now
derives the page on screen through each module's gate (reachablePage), so the rail, the content,
the tab title and the address bar agree, on a link, a Back, and a role taken away mid-session.
peter