Automated verification of all 5 manual test items from PR description:
1. /rewind command flow (pick turn, confirm, verify truncation)
2. Double-ESC opens selector (with btw dismiss handling)
3. ESC during streaming cancels (no rewind)
4. /rewind with no history (guard blocks)
5. After rewind, model ignores removed turns
Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>
