Create a persistent cart component in Hydrogen that maintains state across page reloads.
- Ensure the cart syncs with Shopifys Storefront API.
- Implement local storage or session storage for offline persistence.
- Support add, update, and remove item actions with real-time UI updates.
- Handle quantity updates and display cart subtotal dynamically.
- Use React state management (useState or useReducer) for cart logic.
- Optimize performance by debouncing API calls for quantity changes.