✅ Enhanced: Major Design & UX Improvements

This update was packed with design enhancements!

Variant Settings:
We improved variant settings to support custom labels, dropdowns, and visual color/pattern swatches.
Live Preview:
The setup page for Quantity Breaks now features a live preview and more customization fields, so you can see your changes in real-time.
Template Switching:
You can now easily switch between different Quantity Break templates while in the setup or edit flow.