refactor(App, navigation): migrate to Expo Router and clean up navigation structure

- Updated App entry point to utilize Expo Router, simplifying the navigation setup.
- Removed legacy navigation components and services to streamline the codebase.
- Adjusted package.json to reflect the new entry point and updated dependencies for compatibility.
- Enhanced overall application structure by consolidating navigation logic and improving maintainability.

src/screens/message/MessageListScreen.tsx

@@ -26,8 +26,8 @@ import {
   Platform,
 } from 'react-native';
 import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
-import { useNavigation, useIsFocused } from '@react-navigation/native';
-import { NativeStackNavigationProp } from '@react-navigation/native-stack';
+import { useRouter } from 'expo-router';
+import { useIsFocused } from '@react-navigation/native';
 import { useBottomTabBarHeight } from '@react-navigation/bottom-tabs';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { colors, spacing, fontSizes, shadows, borderRadius } from '../../theme';
@@ -43,9 +43,9 @@ import {
   useMarkAsRead,
   useMessageManagerConversations,
 } from '../../stores';
-import { Avatar, Text, EmptyState, ResponsiveContainer } from '../../components/common';
+import { Avatar, Text, EmptyState, ResponsiveContainer, AppBackButton } from '../../components/common';
 import { useResponsive, useBreakpointGTE } from '../../hooks/useResponsive';
-import { RootStackParamList, MessageStackParamList } from '../../navigation/types';
+import * as hrefs from '../../navigation/hrefs';
 // 导入 EmbeddedChat 组件用于桌面端双栏布局
 import { EmbeddedChat } from './components/EmbeddedChat';
 import { ConversationListRow } from './components/ConversationListRow';
@@ -54,9 +54,6 @@ import { NotificationsScreen } from './NotificationsScreen';
 // 导入扫码组件
 import { QRCodeScanner } from '../../components/business/QRCodeScanner';
 
-type NavigationProp = NativeStackNavigationProp<RootStackParamList>;
-type MessageNavProp = NativeStackNavigationProp<MessageStackParamList>;
-
 // 系统通知会话特殊ID
 const SYSTEM_MESSAGE_CHANNEL_ID = '-1';
 
@@ -76,7 +73,7 @@ interface SearchResultItem {
  * 支持响应式双栏布局
  */
 export const MessageListScreen: React.FC = () => {
-  const navigation = useNavigation<NavigationProp & MessageNavProp>();
+  const router = useRouter();
   const isFocused = useIsFocused();
   const insets = useSafeAreaInsets();
   // 在大屏幕模式下不使用 Bottom Tab Navigator，所以不需要 tabBarHeight
@@ -286,22 +283,25 @@ export const MessageListScreen: React.FC = () => {
         setSelectedConversation(conversation);
       } else if (conversation.type === 'group' && conversation.group) {
         // 群聊 - 窄屏下导航
-        (navigation as any).navigate('Chat', {
-          conversationId: String(conversation.id),
-          groupId: String(conversation.group.id),
-          groupName: conversation.group.name,
-          isGroupChat: true,
-        });
+        router.push(
+          hrefs.hrefChat({
+            conversationId: String(conversation.id),
+            groupId: String(conversation.group.id),
+            groupName: conversation.group.name,
+            isGroupChat: true,
+          })
+        );
       } else {
         // 私聊 - 窄屏下导航
         const currentUserId = useAuthStore.getState().currentUser?.id;
         const otherUser = conversation.participants?.find(p => String(p.id) !== String(currentUserId));
-        (navigation as any).navigate('Chat', {
-          conversationId: String(conversation.id),
-          userId: otherUser ? String(otherUser.id) : undefined,
-          userName: otherUser?.nickname || otherUser?.username,
-          isGroupChat: false,
-        });
+        router.push(
+          hrefs.hrefChat({
+            conversationId: String(conversation.id),
+            userId: otherUser ? String(otherUser.id) : undefined,
+            isGroupChat: false,
+          })
+        );
       }
     });
   };
@@ -311,12 +311,12 @@ export const MessageListScreen: React.FC = () => {
 
   // 创建群聊
   const handleCreateGroup = () => {
-    (navigation as any).navigate('CreateGroup');
+    router.push(hrefs.hrefGroupCreate());
   };
 
   // 主动加群
   const handleJoinGroup = () => {
-    (navigation as any).navigate('JoinGroup');
+    router.push(hrefs.hrefGroupJoin());
   };
 
   const handleOpenActionMenu = () => {
@@ -581,12 +581,13 @@ export const MessageListScreen: React.FC = () => {
               const conversation = await createConversation(String(user.id));
               
               if (conversation) {
-                (navigation as any).navigate('Chat', {
-                  conversationId: String(conversation.id),
-                  userId: String(user.id),
-                  userName: user.nickname || user.username,
-                  isGroupChat: false,
-                });
+                router.push(
+                  hrefs.hrefChat({
+                    conversationId: String(conversation.id),
+                    userId: String(user.id),
+                    isGroupChat: false,
+                  })
+                );
               }
             } catch (error) {
               console.error('创建会话失败:', error);
@@ -660,9 +661,7 @@ export const MessageListScreen: React.FC = () => {
   const renderSearchMode = () => (
     <View style={styles.searchModeContainer}>
       <View style={styles.searchInputContainer}>
-        <TouchableOpacity onPress={handleCloseSearch}>
-          <MaterialCommunityIcons name="arrow-left" size={22} color="#666" />
-        </TouchableOpacity>
+        <AppBackButton onPress={handleCloseSearch} iconColor="#666" />
         <TextInput
           style={styles.searchInput}
           placeholder={activeSearchTab === 'chat' ? '搜索聊天记录' : '搜索用户'}