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Define cache freshness, queued writes, conflict handling, and honest interface states before adding an offline badge to your app.

Turn untrusted responses into typed models, distinguish empty results from failures, and build a network boundary that is easy to test.

A decision guide for local UI state, shared application data, persistent preferences, and recoverable screen state.

Use nullable types, explicit validation, and meaningful defaults to make missing API data predictable instead of hiding it behind assertions.

Handle loading, errors, navigation, and overlapping requests so slow responses do not overwrite the user's latest action.

Separate screens, presentation logic, and data access without burying a small Flutter project in unnecessary layers.