Order Status Helper

Summarize an order object for a support dashboard. The final summary should expose payment status, shipping status, item count, and whether the order needs attention.

1. `isPaid(order)` should return `true` when `payment.status` is `"paid"`.
2. `hasShipped(order)` should return `true` when `shipping.status` is `"shipped"`.
3. `getDeliveryMessage(order)` should return a shipping message and include `estimatedDelivery` when the order has shipped.
4. `needsAttention(order)` should return `true` when the order is unpaid or has not shipped.
5. `createOrderSummary(order)` should return `id`, `customerName`, `paid`, `shipped`, `itemCount`, `deliveryMessage`, and `needsAttention`.