refactor(core): distinguish network errors from auth failures and refactor real-time messaging pipeline

- Add isNetworkError() helper and FetchCurrentUserResult discriminated union to prevent logout on network failures
- Refactor authService to return { kind: 'user' } | { kind: 'auth_failed' } | { kind: 'network_error' }
- Update authStore to preserve login state on network errors, only logout on auth failures
- Replace WSMessageHandler with RealtimeIngestionPipeline for improved real-time message handling
- Remove MessageDeduplication service; add store-level idempotent addOrReplaceMessage for message dedup
- Add atomic systemUnreadCount operations to prevent race conditions
- Add SearchHeader component for consistent search UI across screens
- Add 'home' TabBar variant with underline style matching HomeScreen
- Add Jest test infrastructure and exclude tests from tsconfig
- Fix ChatScreen history lock being stuck when scrolling to latest messages
- Remove unused call_participant_joined/left WS event types

src/screens/message/MessageListScreen.tsx

@@ -61,7 +61,7 @@ import { ConversationListRow } from './components/ConversationListRow';
 // 导入 NotificationsScreen 用于在内部显示
 import { NotificationsScreen } from './NotificationsScreen';
 // 导入扫码组件
-import { SearchBar, TabBar } from '../../components/business';
+import { SearchBar, SearchHeader, TabBar } from '../../components/business';
 import { QRCodeScanner } from '../../components/business/QRCodeScanner';
 
 // 系统通知会话特殊ID
@@ -668,33 +668,27 @@ export const MessageListScreen: React.FC = () => {
   // 渲染搜索模式UI（扁平化现代化设计）
   const renderSearchMode = () => (
     <View style={styles.searchModeContainer}>
-      {/* 搜索头部 */}
-      <View style={[styles.searchHeader, { paddingTop: spacing.sm }]}>
-        <View style={styles.searchShell}>
-          <SearchBar
-            value={searchText}
-            onChangeText={setSearchText}
-            onSubmit={() => performSearch(searchText)}
-            placeholder={activeSearchTab === 'chat' ? '搜索聊天记录' : '搜索用户'}
-            autoFocus
-          />
-        </View>
-        <TouchableOpacity
-          style={styles.cancelButton}
-          onPress={handleCloseSearch}
-          activeOpacity={0.7}
-        >
-          <Text style={styles.cancelText}>取消</Text>
-        </TouchableOpacity>
-      </View>
+      {/* 搜索顶栏（统一组件，内置硬件返回键拦截） */}
+      <SearchHeader
+        value={searchText}
+        onChangeText={setSearchText}
+        onSubmit={() => performSearch(searchText)}
+        onCancel={handleCloseSearch}
+        placeholder={activeSearchTab === 'chat' ? '搜索聊天记录' : '搜索用户'}
+        compact
+      />
 
-      {/* Tab切换 - 现代化风格 */}
+      {/* Tab切换 - 与主页一致的下划线风格 */}
       <View style={styles.searchTabContainer}>
         <TabBar
           tabs={['聊天记录', '用户']}
           activeIndex={activeSearchTab === 'chat' ? 0 : 1}
           onTabChange={(index) => setActiveSearchTab(index === 0 ? 'chat' : 'user')}
-          variant="modern"
+          variant="home"
+          style={{
+            paddingHorizontal: spacing.md,
+            paddingVertical: spacing.xs,
+          }}
         />
       </View>
 
@@ -1048,32 +1042,10 @@ function createMessageListStyles(colors: AppColors) {
     },
     searchModeContainer: {
       flex: 1,
-      backgroundColor: colors.background.paper,
-    },
-    searchHeader: {
-      flexDirection: 'row',
-      alignItems: 'center',
-      backgroundColor: colors.background.paper,
-      borderBottomWidth: 1,
-      borderBottomColor: `${colors.divider}70`,
-      paddingHorizontal: spacing.md,
-      paddingBottom: spacing.sm,
-    },
-    searchShell: {
-      flex: 1,
-    },
-    cancelButton: {
-      paddingHorizontal: spacing.sm,
-      paddingVertical: spacing.xs,
-      marginLeft: spacing.sm,
-    },
-    cancelText: {
-      fontSize: fontSizes.md,
-      fontWeight: '600',
-      color: colors.primary.main,
+      backgroundColor: colors.background.default,
     },
     searchTabContainer: {
-      backgroundColor: colors.background.paper,
+      backgroundColor: colors.background.default,
       borderBottomWidth: 1,
       borderBottomColor: `${colors.divider}50`,
     },