GymTrack

Refactor SnackBar background colors to use AppColors.surfaceVariantDark for consistency across routines and model settings screens; enhance RoutinesScreen with staggered animations and update layout to improve user experience.

Update README.md

Merge branch 'main' of https://github.com/Max-Eee/gym-track

Enable code shrinking and add ProGuard rules for LiteRT-LM and OkHttp; auto-create exercises in PresetPackService if not found

Revise README with new features and AI model details