Update starter code for Dart 3 & null safety.#45
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…rom depreciated to new.
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This update brings the project in line with Dart 3 and the latest stable version of Flutter. I updated the SDK constraints and dependencies (such as
cupertino_icons) to support null safety and avoid version resolution errors. These changes ensure that new learners can run the project seamlessly without encountering compatibility issues when setting up their environment.In addition, I replaced deprecated Flutter widgets like
FlatButtonandRaisedButtonwith their modern equivalents (TextButton,ElevatedButton, etc.) to reflect current best practices. This will help learners follow along with up-to-date code and adopt the recommended Flutter APIs from the start.