[Suggestion] Dithering/Color banding reduction

<img width="2560" height="1440" alt="Image" src="https://github.com/user-attachments/assets/73fb8ce5-6857-4324-9ad6-91088e286079" />

Currently MakeUpUltraFast suffers from some pretty severe color banding in gradients. Lots of other shaders solve this with blue noise dithering and such. Definitely worth investigating!