How to use:
1. Load your spritesheet image
2. Click and drag on the image to select a sprite (red box will appear)
3. The width and height will be automatically set based on your selection
4. Adjust the vertical offset if needed to align with the first row
5. Configure the number of rows and sprites per row
6. Set naming patterns for each row
7. Click "Update Preview" to see how sprites will be split
8. Click "Split Sprites" to download all sprites as a ZIP file