fix: 修复时间戳显示问题

deepsearcher/backend/templates/index.html

@@ -392,13 +392,18 @@
             const contentElement = document.createElement('div');
             contentElement.textContent = message.content;
             
-            const timestampElement = document.createElement('div');
-            timestampElement.className = 'message-timestamp';
-            const date = new Date(message.timestamp * 1000);
-            timestampElement.textContent = date.toLocaleTimeString();
-            
             messageElement.appendChild(contentElement);
-            messageElement.appendChild(timestampElement);
+            
+            // 只有在有有效时间戳时才显示时间
+            if (message.timestamp && !isNaN(message.timestamp)) {
+                const date = new Date(message.timestamp * 1000);
+                if (!isNaN(date.getTime())) {
+                    const timestampElement = document.createElement('div');
+                    timestampElement.className = 'message-timestamp';
+                    timestampElement.textContent = date.toLocaleTimeString();
+                    messageElement.appendChild(timestampElement);
+                }
+            }
             container.appendChild(messageElement);
             
             // 确保结果容器是可见的