feat: 建立整改 Task 1 多端质量基线

app/src/screens/DevicesScreen.tsx

@@ -1,6 +1,6 @@
 import React, { useEffect, useState, useCallback } from 'react';
 import { StyleSheet, View, FlatList, RefreshControl } from 'react-native';
-import { Text, Card, useTheme, ActivityIndicator, Surface, Searchbar, IconButton } from 'react-native-paper';
+import { Text, Card, ActivityIndicator, Surface, Searchbar, IconButton } from 'react-native-paper';
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useNavigation } from '@react-navigation/native';
 import { getDevices } from '../api/devices';
@@ -8,7 +8,6 @@ import { formatRelativeTime } from '../utils/format';
 import type { Device } from '../types';
 
 export default function DevicesScreen() {
-  const theme = useTheme();
   const navigation = useNavigation<any>();
   const [loading, setLoading] = useState(true);
   const [refreshing, setRefreshing] = useState(false);