feat: migrate icons to SF Symbols, refactor explore tab, add collections/programs data layer

- Replace all Ionicons with native SF Symbols via expo-symbols SymbolView
- Create reusable Icon wrapper component (src/shared/components/Icon.tsx)
- Remove @expo/vector-icons and lucide-react dependencies
- Refactor explore tab with filters, search, and category browsing
- Add collections and programs data with Supabase integration
- Add explore filter store and filter sheet
- Update i18n strings (en, de, es, fr) for new explore features
- Update test mocks and remove stale snapshots
- Add user fitness level to user store and types

package.json

@@ -27,7 +27,6 @@
   "dependencies": {
     "@expo-google-fonts/inter": "^0.4.2",
     "@expo/ui": "~0.2.0-beta.9",
-    "@expo/vector-icons": "^15.0.3",
     "@react-native-async-storage/async-storage": "^2.2.0",
     "@react-navigation/bottom-tabs": "^7.4.0",
     "@react-navigation/elements": "^2.6.3",
@@ -60,7 +59,6 @@
     "expo-video": "~3.0.16",
     "expo-web-browser": "~15.0.10",
     "i18next": "^25.8.12",
-    "lucide-react": "^0.576.0",
     "posthog-react-native": "^4.36.0",
     "posthog-react-native-session-replay": "^1.5.0",
     "react": "19.1.0",