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The widget preview scaffold requires that previews are defined within importable libraries. Since Dart does not support absolute paths for imports or relative imports outside of the project, it's not possible for the widget previewer to display previews defined outside of `lib/`. This change updates the preview detector to ignore libraries that don't have a package name (e.g., libraries under `test/`) and updates `packageName` properties to not allow for null to make it clear that package names are required for previews. Fixes https://github.com/flutter/flutter/issues/178651