fix: 修复流式聊天发生错误时继续处理后续事件的问题

- 增加 hasError 标记，错误发生后立即停止处理后续事件
- 在 done 事件处理前检查是否已有错误
- 在 finally 中确保 reader 被正确关闭
- 防止错误发生后，done 事件继续执行导致历史响应被错误回填

src/api.ts

@@ -748,83 +748,94 @@ export async function regenerateMessage(
   return await consumeSSE(resp, handlers, signal);
 }
 
-async function consumeSSE(resp: Response, h: StreamEvents, signal?: AbortSignal) {
-  if (!resp.ok || !resp.body) {
-    const txt = await resp.text().catch(() => '');
-    h.onError?.(`HTTP ${resp.status}: ${txt}`);
-    return;
-  }
-  const reader = resp.body.getReader();
-  const decoder = new TextDecoder('utf-8');
-  let buf = '';
-  try {
-    while (true) {
-      const { value, done } = await reader.read();
-      if (done) break;
-      buf += decoder.decode(value, { stream: true });
+async function consumeSSE(resp: Response, h: StreamEvents, signal?: AbortSignal) {
+  if (!resp.ok || !resp.body) {
+    const txt = await resp.text().catch(() => '');
+    h.onError?.(`HTTP ${resp.status}: ${txt}`);
+    return;
+  }
+  const reader = resp.body.getReader();
+  const decoder = new TextDecoder('utf-8');
+  let buf = '';
+  let hasError = false; // 标记是否已发生错误，避免后续事件继续处理
+
+  try {
+    while (true) {
+      const { value, done } = await reader.read();
+      if (done || hasError) break;
+
+      buf += decoder.decode(value, { stream: true });
       buf = buf.replace(/\r\n/g, '\n');
-
-      let idx;
-      while ((idx = buf.indexOf('\n\n')) !== -1) {
-        const raw = buf.slice(0, idx);
-        buf = buf.slice(idx + 2);
-        if (!raw.trim() || raw.startsWith(':')) continue;
-
-        let event = 'message';
-        let dataStr = '';
-        for (const line of raw.split('\n')) {
-          if (line.startsWith('event:')) event = line.slice(6).trim();
+
+      let idx;
+      while ((idx = buf.indexOf('\n\n')) !== -1 && !hasError) {
+        const raw = buf.slice(0, idx);
+        buf = buf.slice(idx + 2);
+        if (!raw.trim() || raw.startsWith(':')) continue;
+
+        let event = 'message';
+        let dataStr = '';
+        for (const line of raw.split('\n')) {
+          if (line.startsWith('event:')) event = line.slice(6).trim();
           else if (line.startsWith('data:')) {
             let part = line.slice(5);
             if (part.startsWith(' ')) part = part.slice(1);
             dataStr += (dataStr ? '\n' : '') + part;
           }
-        }
-        if (!dataStr) continue;
-        let data: any;
-        try {
-          data = JSON.parse(dataStr);
-        } catch {
-          continue;
-        }
-        switch (event) {
-          case 'meta':
-            h.onMeta?.(data);
-            break;
+        }
+        if (!dataStr) continue;
+        let data: any;
+        try {
+          data = JSON.parse(dataStr);
+        } catch {
+          continue;
+        }
+        switch (event) {
+          case 'meta':
+            h.onMeta?.(data);
+            break;
           case 'retry':
             h.onRetry?.(data);
             break;
           case 'reasoning_delta':
             h.onReasoningDelta?.(data.content || '');
             break;
-          case 'delta':
-            h.onDelta?.(data.content || '');
-            break;
-          case 'tool_call':
-            h.onToolCall?.(data);
-            break;
-          case 'tool_result':
-            h.onToolResult?.(data);
-            break;
-          case 'done':
-            h.onDone?.(data);
-            break;
-          case 'aborted':
-            h.onAborted?.(data);
-            break;
-          case 'error':
-            h.onError?.(data.message || 'stream error');
-            break;
-        }
-      }
-    }
-  } catch (e: any) {
-    if (signal?.aborted || e?.name === 'AbortError') {
-      // 静默：本地已 abort
-      return;
-    }
-    h.onError?.(e?.message ?? String(e));
-  }
+          case 'delta':
+            h.onDelta?.(data.content || '');
+            break;
+          case 'tool_call':
+            h.onToolCall?.(data);
+            break;
+          case 'tool_result':
+            h.onToolResult?.(data);
+            break;
+          case 'done':
+            // 只有在没有错误的情况下才处理 done 事件
+            if (!hasError) {
+              h.onDone?.(data);
+            }
+            break;
+          case 'aborted':
+            h.onAborted?.(data);
+            break;
+          case 'error':
+            hasError = true;
+            h.onError?.(data.message || 'stream error');
+            // 发生错误后立即停止读取
+            break;
+        }
+      }
+    }
+  } catch (e: any) {
+    if (signal?.aborted || e?.name === 'AbortError') {
+      // 静默：本地已 abort
+      return;
+    }
+    h.onError?.(e?.message ?? String(e));
+  } finally {
+    // 确保 reader 被释放
+    reader.cancel().catch(() => {});
+  }
 }
 
 // ============== Workflow (v1.1) ==============