updateRejection method
Implementation
void updateRejection(String rejectionMessage) {
if (_isDisposed || !canUpdateState) return;
_stopAllTimers();
_safeStateUpdate(() => state.copyWith(
documentRejected: true,
rejectionMessage: rejectionMessage,
selectedImage: null,
isUploading: false,
isWaitingForWebSocket: false,
currentProgress: 0.0,
));
}