The Plan's Shopping list action read the week's Supply run but never checked for a failed read, showing "Shopping list" with no count exactly as for a week with no list. WeekBoard now reads the Supply run once and shows a failed read in the screen's ErrorBanner with Retry, while the Shopping list action still opens /plan/shopping?week=<Monday>. A 404 (no list yet) stays a link with no count and no failure. Task: 40cc2de5-6628-4b32-a491-ab8e02911d88 (SR-05) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>