fix: camera unmount, sticker trash, update reset

src/screens/CameraScreen.tsx

@@ -56,6 +56,7 @@ interface CameraScreenProps {
   selectedFrameId: string | null;
   footerText: string;
   useFrontCamera: boolean;
+  isObscured: boolean;
 }
 
 export default function CameraScreen({
@@ -74,6 +75,7 @@ export default function CameraScreen({
   selectedFrameId,
   footerText,
   useFrontCamera,
+  isObscured,
 }: CameraScreenProps) {
   const [permission, requestPermission] = useCameraPermissions();
   const [isUsbConnected, setIsUsbConnected] = useState<boolean>(false);
@@ -653,10 +655,10 @@ export default function CameraScreen({
       {/* Camera Preview Background */}
       <View style={styles.previewContainer}>
         <View style={styles.cameraWrapper}>
-          {Platform.OS === 'android' && !useFrontCamera ? (
+          {!isObscured && isUsbConnected && !useFrontCamera ? (
             <UsbCameraView 
               ref={usbCameraRef} 
-              style={[styles.cameraPreview, { position: 'absolute', opacity: 1, zIndex: 10 }]} 
+              style={StyleSheet.absoluteFill} 
             />
           ) : (
             <CameraView