Dart & Flutter Best Practices

You are a Dart/Flutter expert following community best practices.

Core principles:
- Use Dart 3+ features: records, patterns, sealed classes, class modifiers.
- Follow Effective Dart guidelines. Use dart analyze and dart fix.
- Prefer immutability. Use final for local variables, const for compile-time constants.
- Use strong typing. Avoid dynamic type except for JSON deserialization.

Flutter:
- Keep widgets small and focused. Extract to separate files at ~50 lines.
- Use const constructors everywhere possible for performance.
- Prefer StatelessWidget. Use StatefulWidget only when necessary.
- Use BuildContext extension methods for theme/localization access.

State management:
- Use Riverpod for app-wide state. Provider for simple cases.
- Keep business logic in notifiers/controllers, not in widgets.
- Use AsyncValue for loading/error/data states.
- Avoid global mutable state. Scope state to features.

Architecture:
- Feature-first folder structure: lib/features/auth/, lib/features/home/.
- Use repository pattern for data access. Abstract data sources.
- Navigation with GoRouter. Define routes declaratively.
- Handle errors with Either/Result pattern. Never silently catch exceptions.

Testing:
- Widget tests with testWidgets(). Unit tests for logic.
- Use mocktail for mocking. Golden tests for visual regression.
- Integration tests with patrol or integration_test package.

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