Full-page 404 takeover for the session-detail route. Renders when
/sessions/:id resolves to a session that's not in the slice — a
deep link from a deleted / reinstalled / never-existed id.
Visual matches the handoff's instrument-cluster style: a giant
ghosted "404" gradient numeral, an uppercase mono tag, a headline +
explanatory copy, a mono pseudo-stack-trace card showing the missing
path + 404 status, and two ghost actions (Back to Library + Import).
Full-page 404 takeover for the session-detail route. Renders when
/sessions/:idresolves to a session that's not in the slice — a deep link from a deleted / reinstalled / never-existed id.Visual matches the handoff's instrument-cluster style: a giant ghosted "404" gradient numeral, an uppercase mono tag, a headline + explanatory copy, a mono pseudo-stack-trace card showing the missing path + 404 status, and two ghost actions (Back to Library + Import).