- Rename workouts.tsx to explore.tsx with new functionality
- Add horizontal scrolling collections section with gradient cards
- Add featured workouts section
- Implement filtering by category (All, Full Body, Upper Body, Lower Body, Core, Cardio)
- Implement filtering by level (All Levels, Beginner, Intermediate, Advanced)
- Implement filtering by equipment (All, No Equipment, Band, Dumbbells, Mat)
- Add clear filters button when filters are active
- Add loading states with ActivityIndicator
- Add empty state for no results
- Update tab label from "Workouts" to "Explore"
- Add explore translations for en, fr, de, es
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