CRITICAL GOTCHAS (Top 10)
1. Never Use Polaris url Prop for Internal Navigation
// WRONG — breaks out of iframe
<Button url="/app/pricing">Upgrade</Button>
// CORRECT — stays in iframe
const navigate = useNavigate();
<Button onClick={() => navigate('/app/pricing')}>Upgrade</Button>Rule: url prop is only safe for external URLs. Use useNavigate() for internal routes.
2. Never Use NODE_ENV for Billing isTest Flag
// WRONG — always false on La
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