Added comprehensive product/category restrictions to coupon form
Features Added:
1. Product Selectors:
- Products (include) - multiselect with search
- Exclude products - multiselect with search
- Shows product names with searchable dropdown
- Badge display for selected items
2. Category Selectors:
- Product categories (include) - multiselect
- Exclude categories - multiselect
- Shows category names with search
- Badge display for selected items
3. API Integration:
- Added ProductsApi.list() endpoint
- Added ProductsApi.categories() endpoint
- Fetch products and categories on form load
- React Query caching for performance
4. Form Data:
- Added product_ids field
- Added excluded_product_ids field
- Added product_categories field
- Added excluded_product_categories field
- Proper number/string conversion
UI/UX Improvements:
- Searchable multiselect dropdowns
- Badge display with X to remove
- Shows +N more when exceeds display limit
- Clear placeholder text
- Helper text for each field
- Consistent spacing and layout
Technical:
- Uses MultiSelect component (shadcn-based)
- React Query for data fetching
- Proper TypeScript types
- Number array handling
Note: Brands field not included yet (requires WooCommerce Product Brands extension check)
Result:
- Full WooCommerce coupon restrictions support
- Clean, searchable UI
- Production ready
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