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## Summary by CodeRabbit
* **New Features**
* Error messages in chat cells are now clearly displayed with improved
formatting and dynamic height adjustment for better readability.
* Introduced the ability to remove specific chat cell view models from a
session.
* **Bug Fixes**
* Enhanced error handling to automatically remove invalid chat cell view
models when a message creation fails.
* **Other Improvements**
* Improved internal logic for handling message attachments and added
more detailed debug logging for the copilot response lifecycle.
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