feat: Move preloader to games page and make it reusable

- Create reusable PreloaderScreen component with configurable props
- Move preloader experience from home page to mini games store
- Add consistent preloader to home page for design consistency
- Remove start button from mini games store for direct preloader experience
- Update both pages to use same preloader component with different titles
- Fix TypeScript compilation errors in PreloaderScreen component
- Maintain localStorage tracking for first-time vs returning visitors
- Successfully build and test all changes

Author: josegomez-dev