Remove the unused `qrCodeAtom` from the QR code store to clean up the codebase. Additionally, update the mobile app development prompts to emphasize critical requirements, such as creating a default route, ensuring high-quality UI/UX, and following Expo best practices.
Introduce Expo QR code functionality to allow users to preview their projects on mobile devices. Added a new QR code modal component, integrated it into the chat and preview components, and implemented Expo URL detection in the shell process. This enhances the mobile development workflow by providing a seamless way to test Expo projects directly on devices.
- Clean up and consolidate Preview icon buttons while removing redundant ones.