Function decline

decline(options: DeclineOrderOptions): Promise<void>
Decline an order

This function performs TWO critical operations:
1. Updates the order message's status field from INQUIRY (1) to DECLINED (3)
  - This changes the UI to show the order as declined
2. Sends an order cancellation message to the customer
  - Shows "Canceled" status with optional note
The order information is automatically retrieved from the message.
Parameters
- options: DeclineOrderOptions
Returns Promise<void>
Example
```
// Decline an order with a note
await WPP.order.decline({
  msgId: 'message_id_here',
  declineNote: 'Sorry, we cannot fulfill this order at this time'
});

// Decline without a note
await WPP.order.decline({
  msgId: 'message_id_here'
});
```
- Defined in src/order/functions/decline.ts:65