fix: prevent duplicate history loading

static/src/app.ts

@@ -122,6 +122,7 @@ const appOptions = {
                 skipConversationLoadedEvent: false,
                 skipConversationHistoryReload: false,
                 _scrollListenerReady: false,
+                historyLoading: false,
 
                 // 工具控制菜单
                 icons: ICONS,
@@ -844,16 +845,6 @@ const appOptions = {
                     this.ensureScrollListener();
                 });
 
-                const activeConversationId = this.currentConversationId;
-                if (activeConversationId && !activeConversationId.startsWith('temp_')) {
-                    setTimeout(() => {
-                        if (this.currentConversationId === activeConversationId) {
-                            this.fetchAndDisplayHistory();
-                            this.fetchConversationTokenStatistics();
-                            this.updateCurrentContextTokens();
-                        }
-                    }, 250);
-                }
                 this.logMessageState('resetAllStates:after-cleanup', { reason });
             },
             
@@ -1099,6 +1090,12 @@ const appOptions = {
             // 关键功能：获取并显示历史对话内容
             // ==========================================
             async fetchAndDisplayHistory() {
+                if (this.historyLoading) {
+                    console.log('历史消息正在加载，跳过重复请求');
+                    return;
+                }
+                this.historyLoading = true;
+                try {
                     console.log('开始获取历史对话内容...');
                     this.logMessageState('fetchAndDisplayHistory:start', { conversationId: this.currentConversationId });
                     
@@ -1172,6 +1169,9 @@ const appOptions = {
                         this.messages = [];
                         this.logMessageState('fetchAndDisplayHistory:error-cleared');
                     }
+                } finally {
+                    this.historyLoading = false;
+                }
             },
             
             // ==========================================