Clean NgRx reducers using Immer

A practical introduction to using Immer with NgRx reducers in Angular. Immer's `produce` function lets you write reducers by mutating a draft state directly, eliminating the need for spread syntax and making complex state updates more readable. The post covers a side-by-side comparison of standard NgRx reducers vs. Immer-based ones using a shopping cart example, explains how Immer uses JavaScript Proxies under the hood, and highlights useful features like structural sharing for selectors, automatic object freezing in development, and full compatibility with Redux DevTools.