fix: reduce infinite canvas rate limit bursts

app/canvas/[id]/page.tsx

@@ -393,6 +393,9 @@ export default function CanvasEditorPage({ params }: PageProps) {
   const previousNodeIdsRef = useRef<Set<string>>(new Set());
   const previousBrandForModelRef = useRef("");
   const autoSelectedBrandModelBrandRef = useRef("");
+  const autoTitleAttemptedRef = useRef<Set<string>>(new Set());
+  const autoTitleInFlightRef = useRef<string | null>(null);
+  const autoThumbnailSyncedRef = useRef<string | null>(null);
   const lastLoadedCanvasIdRef = useRef<string>("");
   const requestedAgentMode = mode === "agent";
   const isAgentWorkspaceEnabled = siteSettingsData?.agentEnabled !== false;
@@ -1325,31 +1328,52 @@ export default function CanvasEditorPage({ params }: PageProps) {
   // 智能命名与缩略图逻辑
   useEffect(() => {
     if (isAgentMode) return;
+    const hasDefaultTitle =
+      projectTitle === "未命名画布" || projectTitle === "新画布";
+    if (!hasDefaultTitle || nodes.length === 0) return;
+
+    const imageNode = nodes.find((n) => n.type === "image" && (n.data as any)?.src);
+    const imageSrc = (imageNode?.data as any)?.src;
+    if (!imageSrc || typeof imageSrc !== "string") return;
+
+    const autoTitleKey = `${id}:${imageSrc}`;
+    if (
+      autoTitleAttemptedRef.current.has(autoTitleKey) ||
+      autoTitleInFlightRef.current === autoTitleKey
+    ) {
+      return;
+    }
+
     const autoTitleAndThumbnail = async () => {
-      // 如果标题是默认值，且有图片节点
-      if ((projectTitle === "未命名画布" || projectTitle === "新画布") && nodes.length > 0) {
-        const imageNode = nodes.find(n => n.type === 'image' && (n.data as any)?.src);
-        const imageSrc = (imageNode?.data as any)?.src;
-        if (imageSrc) {
-          try {
-            // 1. 设置缩略图
-            await canvasService.updateProject(id, { thumbnail: imageSrc });
-            
-            // 2. 智能命名
-            const res = await fetch('/api/canvas/auto-title', {
-              method: 'POST',
-              headers: { 'Content-Type': 'application/json' },
-              body: JSON.stringify({ imageUrl: imageSrc })
-            });
-            const data = await res.json();
-            if (data.title) {
-              setProjectTitle(data.title);
-              await canvasService.updateProject(id, { title: data.title });
-              toast.success(`画布已自动命名为：${data.title}`);
-            }
-          } catch (error) {
-            console.error("Auto title failed:", error);
-          }
+      autoTitleAttemptedRef.current.add(autoTitleKey);
+      autoTitleInFlightRef.current = autoTitleKey;
+
+      try {
+        if (autoThumbnailSyncedRef.current !== autoTitleKey) {
+          await canvasService.updateProject(id, { thumbnail: imageSrc });
+          autoThumbnailSyncedRef.current = autoTitleKey;
+        }
+
+        const res = await fetch("/api/canvas/auto-title", {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ imageUrl: imageSrc }),
+        });
+        if (!res.ok) {
+          throw new Error(`Auto title request failed: ${res.status}`);
+        }
+
+        const data = await res.json();
+        if (data.title) {
+          setProjectTitle(data.title);
+          await canvasService.updateProject(id, { title: data.title });
+          toast.success(`画布已自动命名为：${data.title}`);
+        }
+      } catch (error) {
+        console.error("Auto title failed:", error);
+      } finally {
+        if (autoTitleInFlightRef.current === autoTitleKey) {
+          autoTitleInFlightRef.current = null;
         }
       }
     };

components/canvas/CanvasChatPanel.tsx

@@ -2203,7 +2203,6 @@ export function CanvasChatPanel({
   
   // 获取纯 UUID（去掉 canvas- 前缀）用于 API 调用
   const rawChatId = toRawCanvasChatId(activeChatId);
-  const voteSWRKey = rawChatId ? `/api/vote?chatId=${rawChatId}` : null;
   const { mutate } = useSWRConfig();
   const [votingMessageId, setVotingMessageId] = useState<string | null>(null);
   const handleDownloadOriginalImage = useCallback(async (imageUrl: string) => {
@@ -2249,6 +2248,13 @@ export function CanvasChatPanel({
     revalidateOnReconnect: false,
     dedupingInterval: 10000,
   });
+  const initialCanvasMessageCount =
+    activeChatId === chatId ? initialMessages.length : 0;
+  const voteSWRKey =
+    rawChatId &&
+    (historyData?.messages?.length ?? initialCanvasMessageCount) >= 2
+      ? `/api/vote?chatId=${rawChatId}`
+      : null;
   const { data: messageVotes } = useSWR<MessageVote[]>(
     voteSWRKey,
     fetcher,