Cleanup dead variables and unused imports, swap ImageBackground for Image in FrameOverlay

src/screens/CameraScreen.tsx

@@ -23,7 +23,6 @@ import Animated, {
   FadeIn,
   FadeOut,
   withSequence,
-  withDelay,
   runOnJS,
 } from 'react-native-reanimated';
 import { FontAwesomeIcon } from '@fortawesome/react-native-fontawesome';
@@ -290,8 +289,6 @@ export default function CameraScreen({
       triggerFlash();
 
       let capturedUri: string;
-      let rawWidth: number = 0;
-      let rawHeight: number = 0;
 
       if (Platform.OS === 'android' && isUsbConnected && usbCameraRef.current) {
         // USB Camera Capture

src/screens/PreviewScreen.tsx

@@ -71,7 +71,7 @@ export default function PreviewScreen({
 
   // Sticker state
   const [stickers, setStickers] = useState<StickerData[]>([]);
-  const [selectedImageIndex, setSelectedImageIndex] = useState<number | null>(null);
+  const [selectedStickerId, setSelectedStickerId] = useState<string | null>(null);
 
   const mountedRef = useRef(true);
   useEffect(() => {