When we hear the words stateful and stateless , many of us first think about backend systems. Stateless APIs. Sticky sessions. Redis. Horizontal scaling. But the same distinction becomes just as important in frontend applications—especially after the product grows beyond a few pages and a couple of API calls. Imagine opening a food delivery application like Snappfood. You choose an address. Search for a restaurant. Apply a filter. Open a menu. Add food to your basket. Cha...