pine/mempool get explicit icon entries (their extensions aren't .png, so
the default guess 404'd on every render). filebrowser-client: central
authedFetch does ONE transparent re-login when the short-lived JWT
expires (an expired cookie previously kept _authenticated=true and every
Files-card poll 401'd forever), plus a 60s login cooldown so a missing
filebrowser doesn't spam either.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>