Flexible quantity conditions for display rules

Display rules now support precise quantity conditions - "At least", "Exactly", and "At most" - for Product ID, Product name, Product collection handle, Product type, and Product vendor rules.

This lets you create tiered upsell strategies. For example:

• Show a bundle promotion when the cart contains exactly 1 of a specific product
• Switch to broader AI-powered recommendations when there are 2 or more of that product
• Hide a component when the cart has at most 1 item from a certain collection

Previously, only a minimum quantity threshold was available.