1. Category Selection Bug:
- Added 'id' alias to category/tag API responses
- Frontend uses cat.id which was undefined (API returned term_id)
2. Checkout Redirect:
- Changed from window.location.href + reload to navigate()
- Added !isProcessing check to empty cart condition
3. Sidebar Shipping for Virtual-Only:
- Hide Shipping Method section when isVirtualOnly
- Hide Shipping row in totals when isVirtualOnly
4. License Table:
- Table creation runs via ensure_tables() on plugins_loaded
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