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This PR adds a combined example for the CupertinoExpansionTile widget, demonstrating its usage with both available transition modes: fade and scroll. **A demo app showing two CupertinoExpansionTile widgets:** - One using the default fade transition mode - One using the scroll transition mode A corresponding widget test verifying expand/collapse behavior for both tiles ### Issue Closes: #167317 ## Tests - Added widget tests to validate the expand and collapse behavior for both transition modes ## Pre-launch Checklist - [x] I read the [Contributor Guide](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview) and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md) wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide](https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md), including [Features we expect every widget to implement](https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement). - [x] I signed the [CLA](https://cla.developers.google.com/). - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with ///). - [x] I added new tests to check the change I am making, or this PR is [test-exempt](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests). - [x] I followed the [breaking change policy](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes) and added [Data Driven Fixes](https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md) where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord](https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md).