Pricing books: add search and sort to the product list (like the Products section)

Description: When managing pricing books with dozens of products, there is no way to search, filter, or sort the product list. Products appear in random order, forcing us to use browser search (Ctrl+F) to locate specific items. We're requesting search and sort functionality similar to what's already available in the main Products section.

Use case: Our team regularly reviews and updates pricing books that contain numerous products. Without search or sort, managing these lists is time-consuming and inefficient, especially when we need to locate or modify a specific product within a large pricing book.

Proposed solution: Add search and sort to the pricing book product list view, matching the Products section — sorting by product name, SKU, price, etc., and searching by product name or other identifiers.

Expected benefit: Much faster navigation and management of pricing books, reducing time spent searching for products.