- Add camera state tracking and listener management
- Implement addCameraStateListener and removeCameraStateListener methods
- Add state transitions during scanning operations
- Improve error handling with state updates
- Add proper type imports for CameraState and CameraStateListener
This change ensures CapacitorQRScanner fully implements the QRScannerService
interface and provides proper camera state feedback to consumers. Camera state
is now tracked through the entire lifecycle of scanning operations, with
appropriate state transitions for initialization, active scanning, errors,
and cleanup.
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