Cross-Sell Indicators and Category Bulk Ops

Added cross-sell and upsell indicators to the order editor and improved category bulk operations.

New Features

• Added cross-sell and upsell indicator to order editor. Order line items now display an interactive flag when cross-sells or upsells are available. Clicking the flag opens a dialog showing all related products, allowing users to quickly add recommended products directly to the order or quote.
• Improved performance when moving products and clusters between categories using optimized bulk operations. (Backoffice)

Bug Fixes

• Fixed pagination not working correctly in the orders listing.
• Fixed PDF preview getting stuck in loading state when generating PDFs for newly created orders or quotes.
• Fixed manufacturer and supplier dropdown fields showing no options when creating or editing products, despite values being configured. (Backoffice)