This question evaluates knowledge of modern frontend data management, including distinctions between client and server state, comparative understanding of state libraries and caching strategies, and planning incremental migrations within frontend architecture.

You are building a large React SPA that renders high-churn, real-time data (e.g., lists that update frequently, user carts, orders, maps/locations). You need to design a modern approach to data management that scales, is resilient to network variability, and is easy to evolve.
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