app.py

**Fixed Issues:**

1. **Removed invalid theme parameter**: Removed `button_primary_background_fill_active` which doesn't exist in Gradio 6's theme system
2. **Maintained Gradio 6 syntax**: All parameters correctly placed in `demo.launch()` instead of `gr.Blocks()`
3. **Preserved Apple-style design**: The theme still maintains the clean Apple aesthetic with proper color scheme
4. **Kept all functionality**: The app should now run without the theme error

The error was caused by using an invalid parameter name in the theme customization. Gradio 6 has specific parameter names for theme customization, and `button_primary_background_fill_active` is not one of them. The corrected code removes this parameter while maintaining all other theme customizations.