Presentation layer and dependency injection

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The domain and the data are in place — now the screen. How UI state is modelled, why a notifier is a view model, where errors and side effects are handled, what logic may stay in a widget, and how dependencies are wired.

1. Modelling UI state: AsyncValue, a status enum, a sealed union

presentationriverpodfreezedstate

2. Notifier as view model: the presentation layer in Riverpod

presentationriverpodmvvm

3. Showing errors on screen: AsyncValue, retry, empty states

presentationerror-handlingriverpodux

4. The command pattern and side effects

presentationcommandriverpodux

5. The view's rules: what logic may stay in a widget

presentationflutterwidgets

6. DI: constructor injection, Riverpod and get_it compared

diriverpodget-itarchitecture