The State Synchronization Gap In a server-driven architecture, the default interaction model is simple: the client sends a request, and the server returns a snippet of HTML to replace the element that triggered the request (or a specific target). This 1:1 mapping works perfectly for pagination, tab switching, or inline editing. However, real-world applications rarely operate in isolation. A classic friction point arises in e-commerce interfaces: A user clicks "Add to Cart" on a product card deep within the main content area. The product card needs to update (e.g., to show "Added" or update stock status). Simultaneously, the Cart Count in the global navigation bar needs to increment. In a Single Page Application (SPA), you would return a JSON payload and rely on a client-side store (Redux, Zustand, Context) to propagate these changes to two distinct React components. In a traditional Multi-Page Application (MPA), you would reload the entire page. When using...
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