"Enhanced QR Scanning: Camera Selection and Resolution Optimization"

[gkatrakazas]

This pull request introduces several enhancements to the QR scanning component, ensuring more reliable and efficient operation. Key improvements include:

1. Camera Detection on First Permission Grant: Resolves an issue where not all available cameras were detected during the initial granting of camera permissions.
2. Optimized Camera Selection: In scenarios where multiple front or back cameras are present, the system now retains only the cameras with the highest resolution, improving scanning accuracy.
3. Dynamic Webcam Resolution Adjustment: Implements dynamic adjustment of the webcam display to match the best available resolution based on the currently active camera. This ensures optimal clarity and performance during QR scanning.
4. Minor UI Improvements: Includes a minor style fix for the camera switch button, enhancing the user interface and usability.