fix: 在 markdown 渲染前清理裸来源标注词（覆盖句尾。工单等情况）

langgraph/src/components/MessageBubble.tsx

@@ -309,6 +309,11 @@ export default function MessageBubble({ content: rawContent, role, isStreaming,
     content = String(rawContent ?? "");
   }
 
+  // Strip bare source annotation words from content before markdown rendering
+  content = content
+    .replace(/([。！？.!?])\s*(工单|知识库|网络|推断)\s*$/gm, '$1')
+    .replace(/\s+(工单|知识库|网络|推断)\s*$/gm, '');
+
   // 思考计时器
   const [thinkingDuration, setThinkingDuration] = useState(0);
   const thinkingTimerRef = useRef<ReturnType<typeof setInterval> | undefined>(undefined);