Add "Save File" and "Save Content JSON" options to profile share menu,
allowing users to save profiles directly to a chosen location using
fileExporter instead of the system share sheet.
- Refactor QR scanner into separate Scanner module for iOS and macOS
- Add camera selection menu for devices with multiple cameras
- Use Vision framework for QR detection on macOS
- Remove tvOS QR scanner support (continuity camera)
- Add camera entitlement and usage description for macOS
- Fix minor issues in Intents and ExtensionProvider
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