fix: 防止 SSE 客户端 done 事件触发两次

static/js/sse.js

@@ -41,6 +41,7 @@ const SSE = {
                 const decoder = new TextDecoder();
                 let buffer = '';
                 let currentEvent = '';
+                let doneReceived = false;
 
                 while (true) {
                     const { done, value } = await reader.read();
@@ -62,6 +63,9 @@ const SSE = {
                                 data = raw;
                             }
 
+                            // Track explicit done event from backend
+                            if (currentEvent === 'done') doneReceived = true;
+
                             // Call the matching handler
                             if (currentEvent && handlers[currentEvent]) {
                                 handlers[currentEvent](data);
@@ -70,8 +74,8 @@ const SSE = {
                     }
                 }
 
-                // Stream ended
+                // Stream ended — only fire done if backend didn't send an explicit one
-                if (handlers.done) handlers.done();
+                if (handlers.done && !doneReceived) handlers.done();
             } catch (err) {
                 if (err.name === 'AbortError') return;
                 if (handlers.error) handlers.error({ message: err.message });