perf: md渲染块线条样式丢失问题

src/components/xt-chat/chat-view/useChatHandler.tsx

@@ -226,15 +226,13 @@ export default function useChatHandler(options: UseChatHandlerOptions): UseChatH
                 )}
               </div>
             )}
-            {isCollapse && (
-              <div class="relative thought-chain-item">
-                <div class="flex items-center mb-4px">
-                  <img src={isRulCompleted ? icon1 : icon2} width={13} height={13} class="mr-4px" />
-                  <div>{node}</div>
-                </div>
-                <div v-html={md.render(output)} class={outputEleClass} />
+            <div class="relative thought-chain-item" style={{ display: isCollapse ? 'block' : 'none' }}>
+              <div class="flex items-center mb-4px">
+                <img src={isRulCompleted ? icon1 : icon2} width={13} height={13} class="mr-4px" />
+                <div>{node}</div>
               </div>
-            )}
+              <div v-html={md.render(output)} class={outputEleClass} />
+            </div>
             {customRender?.()}
           </>
         );