Add logic to delete stale preview messages when stream preview is degraded. Implement PreviewCleaner interface for Telegram platform and add test coverage. generated by llmgit Co-Authored-By: Claude <noreply@anthropic.com>
Add logic to delete stale preview messages when stream preview is degraded. Implement PreviewCleaner interface for Telegram platform and add test coverage. generated by llmgit Co-Authored-By: Claude <noreply@anthropic.com>