fix(camera): drop unused expo-camera; viewfinder crash-safe on Android

- remove expo-camera dep (autolink forced CameraX 1.6.0 over vision-camera
  4.7.3's pinned 1.5.0-alpha03, breaking device enumeration on Xiaomi)
- Android: disable Skia frame processor in viewfinder - devices w/o
  hardware-buffered ImageAnalysis frames (Xiaomi 14 Ultra) crash in
  frame.getNativeBuffer(); live filter stays on iOS, filters still apply
  at capture/export

package.json

@@ -9,7 +9,6 @@
     "babel-preset-expo": "~57.0.0",
     "expo": "~57.0.7",
     "expo-asset": "~57.0.5",
-    "expo-camera": "~57.0.2",
     "expo-dev-client": "~57.0.6",
     "expo-file-system": "~57.0.1",
     "expo-font": "~57.0.1",

src/components/Viewfinder.tsx

@@ -1,5 +1,5 @@
 import React, { useEffect, useState } from 'react';
-import { View, Text, StyleSheet, Dimensions, TouchableOpacity } from 'react-native';
+import { View, Text, StyleSheet, Dimensions, TouchableOpacity, Platform } from 'react-native';
 import { Camera, useCameraDevice, useSkiaFrameProcessor, type CameraDevice } from 'react-native-vision-camera';
 import { useSharedValue } from 'react-native-reanimated';
 import {
@@ -283,7 +283,10 @@ export default function Viewfinder({
           style={StyleSheet.absoluteFill}
           device={device}
           isActive={true}
-          frameProcessor={frameProcessor}
+          // Android: Skia frame processor crashes on devices w/o hardware-buffered
+          // ImageAnalysis frames (e.g. Xiaomi 14 Ultra). Keep raw preview there;
+          // filters still apply on capture/export. iOS keeps live filtered preview.
+          frameProcessor={Platform.OS === 'android' ? undefined : frameProcessor}
         />
         {renderCameraOverlays()}
       </View>