- rebuild pixel art editor into "PixelCraft" with complete UI redesign

- implement canvas navigation with zoom/pan functionality
- add new tools: fill bucket, eyedropper, line tool
- improve drawing system with preview canvas for line tool
- create proper state management with organized code structure
- add keyboard shortcuts (p/e/f/i/l/space) for quick tool switching
- implement color palette with swatch selection
- enhance history system with proper undo/redo functionality
- add grid toggle and improved export options
- optimize for both UI/UX with status bar and position tracking

Author: TobiasMue91