Product Comparison Logic and List Persistency using Zustand

Act as an E-commerce Feature Developer. Design a robust, highly optimized 'Product Comparison Matrix' feature entirely driven by Zustand state. The internal array must be strictly, mathematically capped to a [MAX_COMPARISON_ITEMS] limit (e.g., 4 items). The state object must efficiently extract and track only the heavy [COMPARABLE_ATTRIBUTES] (e.g., technical specs, dimensions, materials) for each item. Inject brutal [UI_RESTRICTION_LOGIC] directly into the `addToCompare` action that actively prevents the insertion of duplicate product IDs or violently throws an error state if the array limit is exceeded. Ensure the entire comparison list array is wrapped in a persistence layer so high-intent users can continue researching products across multiple days and browser sessions.