feat(app): update check flow, friend-based contacts, global disconnect banner

- AuthContext: post-login checkAppUpdate + silent RN update
- ContactsScreen: ImSDK.listFriends + demoApi profiles, useFocusEffect
- UserSearchScreen: addFriend via ImSDK
- DisconnectBanner moved to AppStack level (global, not per-screen)
- Remove DisconnectBanner from SingleChatScreen and GroupChatScreen

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/context/AuthContext.tsx

@@ -1,7 +1,9 @@
 import React, { createContext, useCallback, useContext, useEffect, useState } from 'react'
-import { XuqmSDK, ImSDK } from '@xuqm/rn-sdk'
+import { Alert, Linking } from 'react-native'
+import { XuqmSDK, ImSDK, UpdateSDK } from '@xuqm/rn-sdk'
 import { demoApi, type UserProfile } from '../api/demo'
 import { save, load, clearSession, K } from '../utils/storage'
+import pluginMeta from '../../plugin.json'
 
 const APP_ID = 'ak_demo_chat'
 const SERVER_URL = 'https://sentry.xuqinmin.com'
@@ -29,6 +31,23 @@ export function AuthProvider({ children }: { children: React.ReactNode }) {
     await XuqmSDK.initialize({ appId: APP_ID, serverUrl: SERVER_URL })
     await ImSDK.loginWithToken(userId, imToken, 'xuqm_im')
     setState({ ready: true, userId, profile })
+
+    UpdateSDK.checkAppUpdate()
+      .then(update => {
+        if (update) {
+          Alert.alert(
+            '发现新版本',
+            `${update.versionName} 是否立即更新？`,
+            [
+              { text: '稍后', style: 'cancel' },
+              { text: '立即更新', onPress: () => Linking.openURL(update.downloadUrl) },
+            ],
+          )
+        } else {
+          UpdateSDK.checkRnUpdate(pluginMeta.moduleId).catch(() => {})
+        }
+      })
+      .catch(() => {})
   }, [])
 
   useEffect(() => {

src/navigation/AppNavigator.tsx

@@ -22,6 +22,7 @@ import GroupMembersScreen from '../screens/group/GroupMembersScreen'
 import GroupSettingsScreen from '../screens/group/GroupSettingsScreen'
 import EditProfileScreen from '../screens/profile/EditProfileScreen'
 import MessageSearchScreen from '../screens/chat/MessageSearchScreen'
+import DisconnectBanner from '../components/DisconnectBanner'
 
 const AuthStack = createNativeStackNavigator<AuthStackParams>()
 const Tab = createBottomTabNavigator<MainTabParams>()
@@ -55,6 +56,7 @@ function MainTabs() {
 function AppStack() {
   return (
     <IMProvider>
+      <DisconnectBanner />
       <Root.Navigator screenOptions={{ headerStyle: { backgroundColor: '#fff' }, headerTintColor: '#333' }}>
         <Root.Screen name="Main" component={MainTabs} options={{ headerShown: false }} />
         <Root.Screen name="SingleChat" component={SingleChatScreen} options={({ route }) => ({ title: route.params.targetName })} />

src/screens/chat/GroupChatScreen.tsx

@@ -10,7 +10,6 @@ import { useAuth } from '../../context/AuthContext'
 import type { RootStackParams } from '../../navigation/types'
 import { MessageBubble } from '../../components/MessageBubble'
 import ChatInput from '../../components/ChatInput'
-import DisconnectBanner from '../../components/DisconnectBanner'
 
 type Props = NativeStackScreenProps<RootStackParams, 'GroupChat'>
 
@@ -85,7 +84,6 @@ export default function GroupChatScreen({ route, navigation }: Props) {
 
   return (
     <SafeAreaView style={styles.root}>
-      <DisconnectBanner />
       <KeyboardAvoidingView
         style={styles.flex}
         behavior={Platform.OS === 'ios' ? 'padding' : undefined}

src/screens/chat/SingleChatScreen.tsx

@@ -10,7 +10,6 @@ import { useAuth } from '../../context/AuthContext'
 import type { RootStackParams } from '../../navigation/types'
 import { MessageBubble } from '../../components/MessageBubble'
 import ChatInput from '../../components/ChatInput'
-import DisconnectBanner from '../../components/DisconnectBanner'
 
 type Props = NativeStackScreenProps<RootStackParams, 'SingleChat'>
 
@@ -86,7 +85,6 @@ export default function SingleChatScreen({ route, navigation }: Props) {
 
   return (
     <SafeAreaView style={styles.root}>
-      <DisconnectBanner />
       <KeyboardAvoidingView
         style={styles.flex}
         behavior={Platform.OS === 'ios' ? 'padding' : undefined}

src/screens/contact/ContactsScreen.tsx

@@ -1,11 +1,12 @@
-import React, { useEffect, useState } from 'react'
+import React, { useEffect, useState, useCallback } from 'react'
 import {
   View, Text, FlatList, StyleSheet, TouchableOpacity, SafeAreaView,
-  TextInput, Alert,
+  ActivityIndicator,
 } from 'react-native'
-import { useNavigation } from '@react-navigation/native'
+import { useNavigation, useFocusEffect } from '@react-navigation/native'
 import type { NativeStackNavigationProp } from '@react-navigation/native-stack'
 import type { RootStackParams } from '../../navigation/types'
+import { ImSDK } from '@xuqm/rn-sdk'
 import { demoApi, type UserProfile } from '../../api/demo'
 import { load, save, K } from '../../utils/storage'
 
@@ -28,11 +29,39 @@ function ContactRow({ user, onPress }: { user: UserProfile; onPress(): void }) {
 export default function ContactsScreen() {
   const navigation = useNavigation<Nav>()
   const [contacts, setContacts] = useState<UserProfile[]>([])
+  const [loading, setLoading] = useState(false)
 
-  useEffect(() => {
-    load<UserProfile[]>(K.CONTACTS).then(c => { if (c) setContacts(c) })
+  const fetchContacts = useCallback(async () => {
+    setLoading(true)
+    try {
+      const friendIds = await ImSDK.listFriends()
+      const profiles: UserProfile[] = []
+      await Promise.all(
+        friendIds.map(async (id) => {
+          try {
+            const results = await demoApi.searchUsers(id)
+            const match = results.find(u => u.userId === id)
+            if (match) profiles.push(match)
+          } catch {/* skip individual failures */}
+        }),
+      )
+      setContacts(profiles)
+      await save(K.CONTACTS, profiles)
+    } catch {
+      // network failed — load from local cache
+      const cached = await load<UserProfile[]>(K.CONTACTS)
+      if (cached) setContacts(cached)
+    } finally {
+      setLoading(false)
+    }
   }, [])
 
+  useFocusEffect(
+    useCallback(() => {
+      fetchContacts()
+    }, [fetchContacts]),
+  )
+
   const openChat = (user: UserProfile) => {
     navigation.navigate('SingleChat', { targetId: user.userId, targetName: user.nickname, targetAvatar: user.avatar })
   }
@@ -50,18 +79,21 @@ export default function ContactsScreen() {
           </TouchableOpacity>
         </View>
       </View>
+      {loading && <ActivityIndicator style={styles.loadingIndicator} color="#07C160" />}
       <FlatList
         data={contacts}
         keyExtractor={u => u.userId}
         renderItem={({ item }) => <ContactRow user={item} onPress={() => openChat(item)} />}
         ItemSeparatorComponent={() => <View style={styles.sep} />}
         ListEmptyComponent={
-          <View style={styles.empty}>
-            <Text style={styles.emptyText}>还没有联系人</Text>
-            <TouchableOpacity onPress={() => navigation.navigate('UserSearch')}>
-              <Text style={styles.emptyLink}>搜索添加</Text>
-            </TouchableOpacity>
-          </View>
+          !loading ? (
+            <View style={styles.empty}>
+              <Text style={styles.emptyText}>还没有联系人</Text>
+              <TouchableOpacity onPress={() => navigation.navigate('UserSearch')}>
+                <Text style={styles.emptyLink}>搜索添加</Text>
+              </TouchableOpacity>
+            </View>
+          ) : null
         }
       />
     </SafeAreaView>
@@ -75,6 +107,7 @@ const styles = StyleSheet.create({
   headerActions: { flexDirection: 'row', gap: 12 },
   headerBtn: { paddingHorizontal: 12, paddingVertical: 6, backgroundColor: '#07C160', borderRadius: 6 },
   headerBtnText: { color: '#fff', fontSize: 13, fontWeight: '600' },
+  loadingIndicator: { marginVertical: 8 },
   row: { flexDirection: 'row', alignItems: 'center', padding: 12, backgroundColor: '#fff' },
   avatar: { width: 46, height: 46, borderRadius: 8, backgroundColor: '#07C160', alignItems: 'center', justifyContent: 'center', marginRight: 12 },
   avatarText: { color: '#fff', fontSize: 18, fontWeight: '600' },

src/screens/contact/UserSearchScreen.tsx

@@ -5,6 +5,7 @@ import {
 } from 'react-native'
 import { useNavigation } from '@react-navigation/native'
 import type { NativeStackNavigationProp } from '@react-navigation/native-stack'
+import { ImSDK } from '@xuqm/rn-sdk'
 import { demoApi, type UserProfile } from '../../api/demo'
 import { load, save, K } from '../../utils/storage'
 import type { RootStackParams } from '../../navigation/types'
@@ -37,13 +38,14 @@ export default function UserSearchScreen() {
 
   const addContact = async (user: UserProfile) => {
     try {
+      await ImSDK.addFriend(user.userId)
       const current = (await load<UserProfile[]>(K.CONTACTS)) ?? []
       if (!current.find(c => c.userId === user.userId)) {
         await save(K.CONTACTS, [...current, user])
       }
-      Alert.alert('已添加', `${user.nickname} 已添加到通讯录`)
+      Alert.alert('已添加为好友')
     } catch {
-      Alert.alert('失败', '添加失败，请重试')
+      Alert.alert('添加失败')
     }
   }