feat: enhance Pokedex with detailed modal, type filtering, and favorites

- Add Pokemon detail modal with moves, abilities, stats, and species info
- Implement type-based filtering with dropdown selector
- Add favorites system with localStorage persistence
- Include star button on each Pokemon card for favoriting
- Add 'Show Favorites' toggle to view only favorited Pokemon
- Enhance data fetching to include comprehensive Pokemon details
- Improve UI with responsive controls and smooth animations
- Maintain original beautiful design while adding new functionality

Resolves #118

Author: HarjobandeepSingh