Swap the two horizontal FilterChip scroll rows with a native segmented Picker for body zone and a toolbar Menu for difficulty level. Fix zone values to match Supabase enum (upper-body, lower-body, full-body). Remove unused FilterChip struct.
Remove the entire Expo/React Native application: routes (app/), source code (src/), assets, iOS native build, config plugins, StoreKit config, npm dependencies, TypeScript/ESLint/Vitest configs, and Expo-specific documentation. The repository now contains only: admin-web, supabase, youtube-worker, tabatago-swift, docs, scripts, and CI/tooling configs.