Bug fixes and performance improvements.

Bug fixes and performance improvements.

Major upgrade to professional diagnostics:
- Added dedicated **NFC** testing
- Expanded professional checks to **26 items**
- Refined camera diagnostics and lens switching experience
- Improved sensor test UX and visual feedback
- Added Settings page (Rate Us / Contact Us)
- Enhanced overall stability and performance

- Bug fixes and UI refinements

- Bug fixes and performance optimizations