feat: 聊天侧边栏新对话按钮统一为 antd Button 样式

src/web/features/chat/ChatPage.tsx

@@ -1,7 +1,7 @@
-import { DeleteOutlined, MoreOutlined } from "@ant-design/icons";
+import { DeleteOutlined, MoreOutlined, PlusOutlined } from "@ant-design/icons";
 import { Conversations } from "@ant-design/x";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
-import { App, Spin } from "antd";
+import { App, Button, Spin } from "antd";
 import { useMemo, useState } from "react";
 
 import type { Conversation } from "../../../shared/api";
@@ -52,23 +52,30 @@ export function ChatPage() {
   return (
     <div className="app-chat-page">
       <div className="app-chat-conversations">
+        <div className="app-chat-conversations-header">
+          <Button
+            block
+            icon={<PlusOutlined />}
+            onClick={() => {
+              void createConversation(project.id, defaultModelId ?? undefined)
+                .then((conv) => {
+                  void queryClient.invalidateQueries({ queryKey: CONVERSATIONS_KEY });
+                  setActiveConversationId(conv.id);
+                })
+                .catch((err: Error) => {
+                  void message.error(`创建会话失败：${err.message}`);
+                });
+            }}
+            type="primary"
+          >
+            新对话
+          </Button>
+        </div>
         {isLoading ? (
           <Spin />
         ) : (
           <Conversations
             activeKey={activeConversationId ?? ""}
-            creation={{
-              onClick: () => {
-                void createConversation(project.id, defaultModelId ?? undefined)
-                  .then((conv) => {
-                    void queryClient.invalidateQueries({ queryKey: CONVERSATIONS_KEY });
-                    setActiveConversationId(conv.id);
-                  })
-                  .catch((err: Error) => {
-                    void message.error(`创建会话失败：${err.message}`);
-                  });
-              },
-            }}
             items={conversations}
             menu={(conv) => ({
               items: [
@@ -85,6 +92,7 @@ export function ChatPage() {
               trigger: <MoreOutlined />,
             })}
             onActiveChange={(key) => setActiveConversationId(key)}
+            rootClassName="app-chat-conversations-list"
           />
         )}
       </div>

src/web/styles.css

@@ -90,6 +90,16 @@ body {
   background: var(--ant-color-bg-container);
 }
 
+.app-chat-conversations-header {
+  padding: var(--ant-padding-sm);
+  border-bottom: 1px solid var(--ant-color-border-secondary);
+}
+
+.app-chat-conversations-list {
+  flex: 1;
+  min-height: 0;
+}
+
 .app-chat-panel {
   display: flex;
   flex: 1;