Patch Parade Fit

Improve Patch Parade Fit's currently shipped Rust/macroquad UI to product-quality visual clarity using the new Game Visual Quality Principles and visual-quality-contract flow. The contract must specifically fix low block/background contrast, overlapping UI, excessive unused whitespace around title/header/buttons, and mobile ad layout risks while preserving the existing puzzle rules, stage catalog, localization, monetization posture, and store identifiers.