Add new posterize feature that allows splitting PDF pages into a grid of smaller pages. The tool includes:
- Configurable rows and columns
- Page size and orientation options
- Content scaling modes
- Overlap settings for assembly
- Page range selection
- Implement core PDF manipulation tools (split, merge, convert, etc.)
- Add state management and UI utilities
- Set up build configuration with Vite and TailwindCSS
- Include essential dependencies for PDF processing
- Add gitignore and basic project configuration files