fix(chat): run assistant typewriter only once per message

components/message.tsx

@@ -177,6 +177,7 @@ function filterAgentRoutingNoise(text: string): string {
 const IMAGE_DONE_SUMMARY = "已完成本次生成，如需微调可继续告诉我。";
 const ASSISTANT_TYPEWRITER_SECTION_REGEX =
   /(?:###\s*需求理解|【\s*需求理解\s*】|###\s*图片分析|【\s*图片分析\s*】|###\s*执行计划|【\s*执行计划\s*】|###\s*输出设置|【\s*输出设置\s*】)/;
+const ASSISTANT_TYPEWRITER_STORAGE_KEY = "assistant-typewriter-completed-keys-v1";
 const MODEL_BADGE_LINE_REGEX =
   /^\s*[◈◇◆🔹⬡✦•·]\s*([A-Za-z][A-Za-z0-9 .:+\-_/()]{2,})\s*$/im;
 const MODEL_BADGE_LINE_GLOBAL_REGEX =
@@ -221,6 +222,60 @@ function shouldUseAssistantTypewriter(text: string): boolean {
 }
 
 const completedTypewriterKeys = new Set<string>();
+let completedTypewriterKeysLoaded = false;
+
+function loadCompletedTypewriterKeys() {
+  if (completedTypewriterKeysLoaded) return;
+  completedTypewriterKeysLoaded = true;
+  if (typeof window === "undefined") return;
+
+  try {
+    const raw = window.localStorage.getItem(ASSISTANT_TYPEWRITER_STORAGE_KEY);
+    if (!raw) return;
+    const parsed = JSON.parse(raw);
+    if (!Array.isArray(parsed)) return;
+    parsed.forEach((key) => {
+      if (typeof key === "string" && key.trim()) {
+        completedTypewriterKeys.add(key);
+      }
+    });
+  } catch {
+    // ignore
+  }
+}
+
+function persistCompletedTypewriterKeys() {
+  if (typeof window === "undefined") return;
+  try {
+    const keep = Array.from(completedTypewriterKeys).slice(-400);
+    window.localStorage.setItem(
+      ASSISTANT_TYPEWRITER_STORAGE_KEY,
+      JSON.stringify(keep)
+    );
+  } catch {
+    // ignore
+  }
+}
+
+function hasCompletedTypewriter(typingKey: string) {
+  loadCompletedTypewriterKeys();
+  return completedTypewriterKeys.has(typingKey);
+}
+
+function markTypewriterCompleted(typingKey: string) {
+  loadCompletedTypewriterKeys();
+  completedTypewriterKeys.add(typingKey);
+  if (completedTypewriterKeys.size > 450) {
+    const overflow = completedTypewriterKeys.size - 400;
+    const iterator = completedTypewriterKeys.values();
+    for (let i = 0; i < overflow; i += 1) {
+      const next = iterator.next();
+      if (next.done) break;
+      completedTypewriterKeys.delete(next.value);
+    }
+  }
+  persistCompletedTypewriterKeys();
+}
 
 function AssistantTypewriter({
   typingKey,
@@ -232,9 +287,10 @@ function AssistantTypewriter({
   children: (displayText: string) => ReactNode;
 }) {
   const content = String(text || "");
-  const [displayText, setDisplayText] = useState(() =>
+  const [displayText, setDisplayText] = useState(() => {
-    completedTypewriterKeys.has(typingKey) ? content : ""
+    if (typeof window === "undefined") return content;
-  );
+    return hasCompletedTypewriter(typingKey) ? content : "";
+  });
 
   useEffect(() => {
     if (!content) {
@@ -242,7 +298,7 @@ function AssistantTypewriter({
       return;
     }
 
-    if (completedTypewriterKeys.has(typingKey)) {
+    if (hasCompletedTypewriter(typingKey)) {
       setDisplayText(content);
       return;
     }
@@ -259,7 +315,7 @@ function AssistantTypewriter({
       setDisplayText(content.slice(0, cursor));
       if (cursor >= content.length) {
         window.clearInterval(timer);
-        completedTypewriterKeys.add(typingKey);
+        markTypewriterCompleted(typingKey);
       }
     }, tickMs);