[App] Simplified and Improved Image Upscaling

The Image Upscaler now uses a streamlined and more reliable 2× enhancement option.

This update replaces the previous “2K” and “4K” modes with a smarter scaling system that:

• Delivers sharper, more natural texture improvements.

• Reduces distortion and artifacting in detailed product areas.

• Provides more consistent results across diverse product types and source qualities.

The new approach ensures that upscaling focuses on clarity, realism, and product detail preservation rather than arbitrary resolution labels, resulting in cleaner, more dependable upscaled images across the board.