The token is no longer stored; a tbp_session flag remembers the
login. apiFetch renews the session once on a 401 and sends the
request again. Parallel requests and other tabs share one refresh,
because Auth revokes the session when a refresh token is used twice.
Only a 401 from the refresh ends the session; a 502 or no network
shows the normal error.
Every 401 from Auth or Core now goes through useSessionExpired: the login page
says the session expired and returns to the last page after login. App no
longer removes a token that only the browser clock calls expired, so a backend
401 is the one signal. A 403 on the profile now shows an error instead.
Header links to Dashboard, Library and Settings. The logo, the login page and
the landing page lead logged-in users to the dashboard. Expired tokens are
removed, and a 403 on the dashboard logs out. Remove the dev dummy token.
lobo