v1.2.0

chore: release version 1.2.0 with new features and improvements

- Added a comprehensive configuration panel for managing user settings, including preferences, statistics, notifications, and data management.
- Implemented import/export functionality for workspace data, allowing users to save and restore tasks and settings in JSON format.
- Introduced a "Clear All Data" feature with a safety confirmation dialog to prevent accidental deletions.
- Enhanced UI for the configuration panel and improved button styling for better user experience.
- Fixed issues with subtask auto-save and settings synchronization across views.