Integrate PlatformServiceFactory to provide platform-specific data export:
- Add platform-specific file saving for Capacitor and other platforms
- Use web download mechanism only in web platform
- Conditionally show platform-specific save instructions
- Add iOS/Android detection for targeted guidance
- Update success messages based on platform context
- Improve download link visibility logic for web platform
This change ensures proper file handling across web, mobile, and desktop
platforms while maintaining a consistent user experience.
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