<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **New Features**
- Added the ability to select line width for pen tools, allowing users to customize brush and highlighter thickness in the toolbar menu.
- **Bug Fixes**
- Restored and verified the functionality for adding brush elements with different sizes, ensuring accurate rendering of brush strokes based on selected size.
- **Improvements**
- Enhanced slider component interaction by refining pointer event handling and updated slider styles for better touch interaction support.
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