fix(chat): keep audit results on abort and stop blank success messages

- emit STOPPED terminal chunk on abort so partial text and pending
  auditResult/auditExport stay attached to the message
- fill '已停止生成。' when nothing was streamed, and skip local
  fallback scoring once the user has stopped
- treat aborted signal (including string abort reason) as terminal in
  the request catch
- drop stale stream/error updates in useChat when the target message
  was removed, e.g. after switching conversations

src/pages/Chat/index.jsx

@@ -1023,6 +1023,24 @@ export default forwardRef((props, ref) => {
       };
     }
 
+    if (chunk.data === 'STOPPED') {
+      // 停止/中断收尾：保留已流式输出的内容，并补挂本次已生成的审计结果
+      return {
+        ...originMessage,
+        role: 'assistant',
+        content: originContent || '已停止生成。',
+        auditResult:
+          originMessage?.auditResult ||
+          pendingAuditResultRef.current ||
+          undefined,
+        auditExport:
+          originMessage?.auditExport ||
+          pendingAuditExportRef.current ||
+          undefined,
+        tool_calls: undefined,
+      };
+    }
+
     try {
       let messageData;
       try {
@@ -1124,6 +1142,15 @@ export default forwardRef((props, ref) => {
     }${agentPrompt}`;
   };
 
+  // 用户已停止时抛出 AbortError，跳过后续兜底分析，由请求层统一走 STOPPED 收尾
+  const throwIfAborted = () => {
+    if (abortController.current?.signal?.aborted) {
+      const abortError = new Error('Aborted');
+      abortError.name = 'AbortError';
+      throw abortError;
+    }
+  };
+
   const getMessagePrompt = async (message) => {
     const topic = conversationTopic;
 
@@ -1339,6 +1366,7 @@ export default forwardRef((props, ref) => {
             }
           }
           if (!result) {
+            throwIfAborted();
             let queryExpansion = null;
             if (!isRefine) {
               try {
@@ -1411,6 +1439,7 @@ export default forwardRef((props, ref) => {
             }
           }
           if (!result) {
+            throwIfAborted();
             result = buildAuditResult(
               message.content,
               records,
@@ -1443,9 +1472,9 @@ export default forwardRef((props, ref) => {
       { onUpdate, onSuccess, onError, onStream },
     ) => {
       const chunks = [];
+      const controller = new AbortController();
+      onStream(controller);
       try {
-        const controller = new AbortController();
-        onStream(controller);
         pendingAuditResultRef.current = null;
         pendingAuditExportRef.current = null;
 
@@ -1679,7 +1708,12 @@ export default forwardRef((props, ref) => {
 
         onSuccess(chunks);
       } catch (error) {
-        if (error.name === 'AbortError') {
+        if (error.name === 'AbortError' || controller.signal.aborted) {
+          // 停止/中断收尾：发 STOPPED 保留已输出内容并补挂审计结果，
+          // 避免结构化清单丢失；完全没有输出时由 transformMessage 填充停止提示
+          onUpdate({
+            data: 'STOPPED',
+          });
           onSuccess(chunks);
         } else {
           onError(error);

src/utils/chatRuntime.js

@@ -109,6 +109,8 @@ export function useChat({
           (item) => item.id === updatingMessageId,
         );
         if (!current) {
+          // 消息已创建过但被移除（如切换会话重置消息列表）时，丢弃过期更新
+          if (updatingMessageId) return;
           const nextMessage = createMessage(
             transformMessage({ chunk, chunks, status }),
             status,
@@ -144,6 +146,13 @@ export function useChat({
           onUpdate: (chunk) => updateMessage('loading', chunk, []),
           onSuccess: (chunks) => updateMessage('success', undefined, chunks),
           onError: async (error) => {
+            if (
+              updatingMessageId &&
+              !messagesRef.current.some((item) => item.id === updatingMessageId)
+            ) {
+              // 消息已被移除（如切换会话重置消息列表）时，丢弃过期错误回退
+              return;
+            }
             const fallback = await requestFallback(message, {
               error,
               messages: getRequestMessages(),