Mobile Image Cropper Enhancement (Wordpress plugin)

I need to enhance a WordPress image cropping plugin for mobile users. The plugin currently works well on desktop, but the cropping area is too small on mobile devices. It uses cropper.js.

Requirements:
- Optimize cropping area for both small and medium mobiles
- Make cropping modal full screen on mobile
- Fix the cancel button: should not remove the previously uploaded image
- Add a rule of thirds grid to help users centralize the image

Ideal Skills & Experience:
- Proficient in WordPress development
- Experience with cropper.js
- Strong understanding of responsive design and mobile optimization
- JavaScript and CSS expertise