phsl / new-api

- Add message operations (copy, retry, delete) with tooltips
- Improve thinking chain processing and display logic
- Enhance error handling and debug information presentation
- Optimize UI layout and responsive design
  - Fix height calculations for better viewport usage
  - Improve mobile view adaptability
- Add comprehensive error feedback for message operations
- Implement fallback clipboard functionality
- Refine debug panel with better error tracking
- Add transition animations for better UX
- Update styling with modern gradient backgrounds