Improve demo app to showcase all components

[OneXeor]

Description

Current demo app is minimal and doesn't properly showcase components.

Tasks

• Add fragment-based navigation between components
• Show interactive examples for each component
• Demonstrate all customization options
• Add Compose examples section
• Add theme switching (light/dark)
• Show code snippets in-app

Current State

• Only shows BottomNavigationBar setup
• ParticleProgressBar hidden
• No touch interaction demos
• No Compose components shown