Fix order paid and completed dates to respect historical creation dates

[layoutd]

Summary

Fixes an issue where orders generated with historical dates (using --date-start and --date-end flags) would have their paid and completed dates set to the current time instead of being based on the order's creation date.

Problem

When generating orders with historical creation dates, the order generator was setting the paid and completed dates before the initial $order->save() call. WooCommerce's status transition hooks during the save would override these dates with the current timestamp, resulting in orders with creation dates in the past but paid/completed dates of today.

Solution

This PR moves the date-setting logic to after the initial order save. By setting the dates after the order has been created and its status set, we prevent WooCommerce from overriding them. The dates are now correctly calculated relative to the order's creation date:

• Paid date: 0-36 hours after creation date
• Completed date: 0-36 hours after paid date

Testing

Generate orders with historical dates and verify that paid and completed dates are now set relative to the creation date rather than the current time:

wp wc generate orders 10 --date-start=2024-01-01 --date-end=2024-12-31 --status=completed

🤖 Generated with Claude Code

[layoutd]

The issue is with refund dates so will be solved directly in #182