feat(ai): 优化UI

service-web/client/src/pages/ai/Conversation.tsx

@@ -27,14 +27,6 @@ const ConversationDiv = styled.div`
         margin-bottom: 30px;
         padding-left: 30px;
         padding-right: 30px;
-
-        think {
-            color: gray;
-            display: block;
-            border-left: 3px solid lightgray;
-            padding-left: 10px;
-            margin-bottom: 10px;
-        }
     }
 
     .conversation-sender {
@@ -134,6 +126,7 @@ function Conversation() {
                       ? <span/>
                       : <Collapse
                         size="small"
+                        defaultActiveKey={0}
                         items={[
                           {
                             key: 0,