- Add TypeScript type definitions for merge and alternate-merge Web Workers
- Implement custom rotation angle input with increment/decrement controls for rotate tool
- Extend delete-pages tool to render page thumbnails for better UX
- Hide number input spin buttons across all number inputs via CSS
- Refactor rotateAll function to accept angle parameter instead of direction multiplier
- Update fileHandler to support delete-pages tool thumbnail rendering
- Improve type safety in alternate-merge logic with proper interface definitions
- Enhance rotate tool UI with custom angle input field and adjustment buttons
