更新了一些功能（媒体预览有bug）

src/stores/chat.js

@@ -84,6 +84,15 @@ export const useChatStore = defineStore("chat", () => {
     }
   }
 
+  // 设置当前好友 - 新增方法
+  const setCurrentFriend = (friend) => {
+    currentFriend.value = friend
+    // 清除未读消息计数
+    if (friend) {
+      friend.unreadCount = 0
+    }
+  }
+
   // 切换当前聊天好友
   const switchFriend = async (friend, currentUserId) => {
     currentFriend.value = friend
@@ -101,27 +110,6 @@ export const useChatStore = defineStore("chat", () => {
       messages.value = []
     }
   }
-  // 切换当前聊天好友
-  const setCurrentFriend = async (friend, currentUserId) => {
-    currentFriend.value = friend
-
-    // 清空未读消息计数
-    friend.unreadCount = 0
-    await chatDB.clearUnreadCount(friend.id)
-
-    // 加载聊天记录
-    try {
-      const chatHistory = await chatDB.getChatHistory(currentUserId, friend.id)
-      console.log("chatHistory:", chatHistory)
-      console.log("currentUserId:", currentUserId)
-      console.log("friend.id:", friend.id)
-      messages.value = chatHistory.sort((a, b) => a.timestamp - b.timestamp)
-      console.log("messages.value:", messages.value)
-    } catch (error) {
-      console.error("加载聊天记录失败:", error)
-      messages.value = []
-    }
-  }
 
   // 添加消息
   const addMessage = async (message, currentUserId) => {
@@ -215,8 +203,8 @@ export const useChatStore = defineStore("chat", () => {
     connectionStatusIcon,
     initDB,
     loadFriends,
-    switchFriend,
     setCurrentFriend,
+    switchFriend,
     addMessage,
     handleIncomingMessage,
   }