spark 2.1.0 splat viewer tab with OS-fused gyro look-around

WebView-hosted Spark renderer (butterfly.spz demo scene), fixed camera
position, rotation driven by expo-sensors DeviceMotion (ROTATION_VECTOR /
CoreMotion xMagneticNorthZVertical) via injectJavaScript; web fallback
uses deviceorientation in an iframe. Tap to re-center yaw.

package.json

@@ -22,6 +22,7 @@
     "expo-image": "~3.0.11",
     "expo-linking": "~8.0.12",
     "expo-router": "~6.0.24",
+    "expo-sensors": "~15.0.8",
     "expo-splash-screen": "~31.0.13",
     "expo-status-bar": "~3.0.9",
     "expo-symbols": "~1.0.8",
@@ -31,17 +32,18 @@
     "react-dom": "19.1.0",
     "react-native": "0.81.5",
     "react-native-gesture-handler": "~2.28.0",
-    "react-native-worklets": "0.5.1",
     "react-native-reanimated": "~4.1.1",
     "react-native-safe-area-context": "~5.6.0",
     "react-native-screens": "~4.16.0",
-    "react-native-web": "~0.21.0"
+    "react-native-web": "~0.21.0",
+    "react-native-webview": "13.15.0",
+    "react-native-worklets": "0.5.1"
   },
   "devDependencies": {
     "@types/react": "~19.1.0",
-    "typescript": "~5.9.2",
     "eslint": "^9.25.0",
-    "eslint-config-expo": "~10.0.0"
+    "eslint-config-expo": "~10.0.0",
+    "typescript": "~5.9.2"
   },
   "private": true
 }