Let the Compiler Review Your UI: Choosing Between Enums, Sealed Classes, and Sealed Interfaces

<p><em>A practical decision guide, built around a parcel-tracking screen, with exhaustive</em> <code>when</code> <em>as the compile-time safety net for UI state and navigation events.</em></p> <p>Picture this composite scenario. A parcel-tracking app ships a new <code>Archived</code> state. The product manager is delighted, QA signs off on the new screen, and two weeks later support tickets start

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