claude@clouddev1
2584e76b22
In --demo mode, an otherwise-invisible key (Tab, Enter, arrows, Ctrl-O, …) raises a transient [LABEL] badge — a floating black-on-yellow box inset at the output panel's bottom-right. Set in App::update before the modal gate (so it shows over the load picker, the #24 cast); pure demo_badge_label maps the key set. The runtime expires it on a ~1.5s timer via a new nearest_deadline helper that extends the existing time-boxed-recv arm condition without disturbing the ADR-0027 indicator debounce. New App.last_output_area lets the top-level draw anchor the overlay; overlay colours centralised in theme.rs. Tier 1 (label fn, badge set/seq, over-modal), Tier 2 (dark/light snapshots, black-on-yellow style, too-small clamp), runtime unit (nearest_deadline). Phase B of ADR-0047; captions land in C.