debug: 添加占位图状态调试日志

components/messages.tsx

@@ -266,16 +266,30 @@ function PureMessages({
       }
     } else {
       // 非智能自动模式的原有逻辑
+      // 🆕 调试日志
+      console.log("[Messages useEffect] 非智能模式:", {
+        status,
+        isImageGenModel,
+        isGeminiModel,
+        lastMessageRole: lastMessage?.role,
+        hasContent,
+        selectedModelId,
+      });
+      
       if (status === "submitted") {
+        console.log("[Messages useEffect] status=submitted，显示占位图");
         setShowThinkingWithDelay(true);
       } else if (status === "streaming" && lastMessage?.role === "assistant" && !hasContent) {
+        console.log("[Messages useEffect] streaming无内容，显示占位图");
         setShowThinkingWithDelay(true);
       } else if (status === "streaming" && lastMessage?.role === "assistant" && hasContent) {
+        console.log("[Messages useEffect] streaming有内容，延迟隐藏占位图");
         const timer = setTimeout(() => {
           setShowThinkingWithDelay(false);
         }, delayTime);
         return () => clearTimeout(timer);
       } else {
+        console.log("[Messages useEffect] 其他状态，隐藏占位图");
         setShowThinkingWithDelay(false);
       }
     }