React debug rescue

A compact sample for turning a vague broken-app report into a first fix plan: reproduce, isolate state/API/render behavior, patch one path, and verify before expanding scope.

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Highpriority
6hfirst pass
Mediumrepo risk

Likely root cause

Coupon response and optimistic cart state are racing. The UI trusts stale derived totals before the server-confirmed cart snapshot lands.

First fix path

    Paid diagnostic slice

    One broken path, safe preflight, concise fix or root-cause report.

    $200