feat(chat): refactor chat page layout with secondary agent list sidebar

- 聊天页移至 /chat 路由，不再强制依赖 URL id
- 左侧增加二级侧边栏：展示用户所有 Agent 列表
- 当未选择 Agent 时显示空白状态占位
- 历史会话迁移至顶部栏『历史对话』Drawer 内

src/App.tsx

@@ -18,19 +18,7 @@ import { useAuth } from './store/auth';
 import { AgentAPI } from './api';
 
 function HomeRedirect() {
-  const navigate = useNavigate();
+  return <Navigate to="/chat" replace />;
-  useEffect(() => {
-    AgentAPI.list().then(list => {
-      if (list.length > 0) {
-        navigate(`/agents/${list[0].id}/chat`, { replace: true });
-      } else {
-        navigate('/agents', { replace: true });
-      }
-    }).catch(() => {
-      navigate('/agents', { replace: true });
-    });
-  }, [navigate]);
-  return <div className="flex items-center justify-center h-full"><Spin size="large" /></div>;
 }
 
 export default function App() {
@@ -54,10 +42,12 @@ export default function App() {
   const mainContent = (
     <Routes>
       <Route path="/" element={<HomeRedirect />} />
+      <Route path="/chat" element={<ChatPage />} />
+      <Route path="/chat/:id" element={<ChatPage />} />
       <Route path="/agents" element={<AgentList />} />
       <Route path="/agents/new" element={<AgentEditor />} />
       <Route path="/agents/:id" element={<AgentEditor />} />
-      <Route path="/agents/:id/chat" element={<ChatPage />} />
+      <Route path="/agents/:id/chat" element={<Navigate to="/chat" replace />} />
       <Route path="/marketplace" element={<MarketplacePage />} />
       <Route path="/teams" element={<TeamsPage />} />
       <Route path="/prompts" element={<PromptLibraryPage />} />

src/components/Sidebar.tsx

@@ -28,7 +28,7 @@ const NAV_GROUPS: Array<{
   {
     label: '工作台',
     items: [
-      { to: '/', icon: <MessageOutlined />, label: '聊天', end: true },
+      { to: '/chat', icon: <MessageOutlined />, label: '聊天' },
       { to: '/agents', icon: <RobotOutlined />, label: '我的智能体' },
       { to: '/marketplace', icon: <CompassOutlined />, label: '智能体广场' }
     ]

src/pages/AgentList.tsx

@@ -226,9 +226,9 @@ export default function AgentList() {
                 </Space>
 
                 <div style={{ display: 'flex', gap: 8, marginTop: 'auto', paddingTop: 16, borderTop: '1px solid var(--color-border)' }}>
-                  <Link to={`/agents/${a.id}/chat`} style={{ flex: 1 }}>
+                  <Link to={`/chat/${a.id}`} style={{ flex: 1 }}>
                     <Button type="primary" block icon={<MessageOutlined />} style={{ borderRadius: 12, height: 40, fontWeight: 600 }}>
-                      对话
+                      聊天
                     </Button>
                   </Link>
                   <Link to={`/agents/${a.id}`} style={{ flex: 1 }}>

src/pages/ChatPage.tsx

@@ -46,6 +46,8 @@ export default function ChatPage() {
   const [sessionId, setSessionId] = useState<string | null>(null);
   const [highlightId, setHighlightId] = useState<string | null>(null);
   const [sessionRefresh, setSessionRefresh] = useState(0);
+  const [agentList, setAgentList] = useState<Agent[]>([]);
+  const [historyDrawerOpen, setHistoryDrawerOpen] = useState(false);
   const [mcpDrawerOpen, setMcpDrawerOpen] = useState(false);
   const [paramsDrawerOpen, setParamsDrawerOpen] = useState(false);
   const [tplDrawerOpen, setTplDrawerOpen] = useState(false);
@@ -85,11 +87,24 @@ export default function ChatPage() {
   };
 
   const loadAgent = async () => {
-    if (!id) return;
+    if (!id) {
+      setAgent(null);
+      setMessages([]);
+      return;
+    }
     const a = await AgentAPI.detail(id);
     setAgent(a);
   };
 
+  const loadAgentList = async () => {
+    try {
+      const list = await AgentAPI.list();
+      setAgentList(list);
+    } catch (e) {
+      // ignore
+    }
+  };
+
   const loadProviders = async () => {
     try {
       const list = await LLMProviderAPI.list();
@@ -117,6 +132,10 @@ export default function ChatPage() {
     });
   };
 
+  useEffect(() => {
+    loadAgentList();
+  }, []);
+
   useEffect(() => {
     loadAgent();
     loadProviders();
@@ -125,9 +144,10 @@ export default function ChatPage() {
   }, [id]);
 
   useEffect(() => {
+    if (!id) return;
     loadMessages();
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [sessionId, highlightId]);
+  }, [sessionId, highlightId, id]);
 
   /** 把附件文本拼成 system 注入字符串 */
   const buildAttachmentsText = () => {
@@ -395,11 +415,9 @@ export default function ChatPage() {
     (activeModelValue.includes('/') ? providers.find((item) => item.id === activeModelValue.split('/')[0])?.name : defaultProvider?.name) ||
     (agentModel ? '当前 Agent 配置' : defaultProvider?.name || '系统默认');
 
-  if (!agent) return null;
-
   return (
     <div className="chat-shell">
-      {/* 1. 二级侧边栏：会话列表 */}
+      {/* 1. 二级侧边栏：智能体列表 */}
       <aside
         className="chat-side"
         style={{
@@ -407,139 +425,105 @@ export default function ChatPage() {
           flexDirection: 'column',
           gap: 0,
           background: 'var(--color-surface)',
-          borderRight: '1px solid var(--color-border)'
+          borderRight: '1px solid var(--color-border)',
+          width: 260
         }}
       >
+        <div style={{ padding: '16px', borderBottom: '1px solid var(--color-border)' }}>
+          <Button block type="dashed" onClick={() => navigate('/agents/new')}>+ 创建智能体</Button>
+        </div>
+        <div style={{ flex: 1, overflowY: 'auto', padding: '8px 0' }}>
+          {agentList.map((a) => {
+            const isActive = a.id === id;
+            return (
               <div
+                key={a.id}
+                onClick={() => navigate(`/chat/${a.id}`)}
                 style={{
                   display: 'flex',
                   alignItems: 'center',
                   gap: 12,
-            marginBottom: 20,
+                  padding: '10px 16px',
-            padding: '8px 0 16px',
+                  cursor: 'pointer',
-            borderBottom: '1px solid var(--color-border)'
+                  background: isActive ? 'var(--color-surface-2)' : 'transparent',
+                  borderLeft: `3px solid ${isActive ? 'var(--color-brand)' : 'transparent'}`,
+                  transition: 'background 0.2s'
                 }}
               >
                 <div
-            className="avatar"
                   style={{
-              width: 42,
+                    width: 32,
-              height: 42,
+                    height: 32,
                     borderRadius: '50%',
-              background: agent.avatar || 'var(--gradient-brand)',
+                    background: a.avatar || 'var(--gradient-brand)',
                     color: '#fff',
                     display: 'flex',
                     alignItems: 'center',
                     justifyContent: 'center',
                     fontWeight: 700,
-              fontSize: 18,
+                    fontSize: 14,
-              overflow: 'hidden',
+                    overflow: 'hidden'
-              boxShadow: 'var(--shadow-sm)'
                   }}
                 >
-            {isImageUrl(agent.avatar) ? (
+                  {isImageUrl(a.avatar) ? (
-              <img src={agent.avatar} className="w-full h-full object-cover" alt="avatar" />
+                    <img src={a.avatar} className="w-full h-full object-cover" alt="avatar" />
                   ) : (
-              (agent.name?.charAt(0) || '?').toUpperCase()
+                    (a.name?.charAt(0) || '?').toUpperCase()
                   )}
                 </div>
                 <div style={{ flex: 1, minWidth: 0 }}>
-            <div style={{ fontWeight: 600, fontSize: 15, color: 'var(--color-text)' }}>{agent.name}</div>
+                  <div style={{ fontWeight: isActive ? 600 : 500, fontSize: 14, color: 'var(--color-text)', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
-            <div
+                    {a.name}
-              style={{
-                fontSize: 12,
-                color: 'var(--color-text-secondary)',
-                overflow: 'hidden',
-                textOverflow: 'ellipsis',
-                whiteSpace: 'nowrap'
-              }}
-            >
-              {agent.description || '智能体'}
                   </div>
                 </div>
               </div>
-
+            );
-        {/* 会话切换 */}
+          })}
-        <div style={{ flex: 1, minHeight: 0, overflow: 'hidden', display: 'flex', flexDirection: 'column' }}>
-          {id && (
-            <SessionSidebar
-              agentId={id}
-              activeSessionId={sessionId}
-              onChange={(sid, opts) => {
-                setSessionId(sid);
-                setHighlightId(opts?.highlightMessageId || null);
-              }}
-              refreshTick={sessionRefresh}
-            />
-          )}
         </div>
-
-        <Divider style={{ margin: '12px 0', borderColor: 'var(--color-border)' }} />
-
-        <Space direction="vertical" style={{ width: '100%' }} size={4}>
-          <div
-            style={{
-              padding: '10px 12px',
-              background: 'var(--color-surface-2)',
-              borderRadius: 12,
-              border: '1px solid var(--color-border)',
-              display: 'flex',
-              justifyContent: 'space-between',
-              alignItems: 'center',
-              marginBottom: 8
-            }}
-          >
-            <span style={{ fontSize: 12, color: 'var(--color-text-secondary)', fontWeight: 500 }}>
-              ⚡ 流式输出
-            </span>
-            <Switch size="small" checked={useStream} onChange={setUseStream} />
-          </div>
-          
-          <Button
-            block
-            size="middle"
-            icon={<SettingOutlined />}
-            onClick={() => setParamsDrawerOpen(true)}
-            style={{ borderRadius: 10, height: 38 }}
-          >
-            模型参数
-          </Button>
-          <Button
-            block
-            size="middle"
-            icon={<ApiOutlined />}
-            onClick={() => setMcpDrawerOpen(true)}
-            style={{ borderRadius: 10, height: 38 }}
-          >
-            MCP 资源
-          </Button>
-          <Button
-            block
-            size="middle"
-            icon={<EditOutlined />}
-            onClick={() => navigate(`/agents/${id}`)}
-            style={{ borderRadius: 10, height: 38 }}
-          >
-            管理 Agent
-          </Button>
-          <Popconfirm title="清空当前会话所有消息？" onConfirm={handleClear}>
-            <Button danger block size="middle" icon={<DeleteOutlined />} style={{ borderRadius: 10, height: 38 }}>
-              清空对话
-            </Button>
-          </Popconfirm>
-        </Space>
       </aside>
 
       {/* 2. 主聊天区 */}
-      <section className="chat-main">
+      <section className="chat-main" style={{ flex: 1, display: 'flex', flexDirection: 'column', position: 'relative' }}>
+        {!agent ? (
+          <div style={{ flex: 1, display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
+            <Empty description="请在左侧选择一个智能体开始对话" />
+          </div>
+        ) : (
+          <>
             {/* Header */}
-        <div className="chat-header">
+            <div className="chat-header" style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', padding: '0 24px' }}>
-          <div style={{ textAlign: 'center' }}>
+              <div>
                 <div style={{ fontWeight: 600, fontSize: 16, color: 'var(--color-text)' }}>{agent.name}</div>
                 <div style={{ fontSize: 12, color: 'var(--color-text-tertiary)' }}>
                   {agent.model || '默认模型'} · T={agent.temperature}
                 </div>
               </div>
+              <Space>
+                <div style={{ display: 'flex', alignItems: 'center', gap: 6, marginRight: 12 }}>
+                  <span style={{ fontSize: 12, color: 'var(--color-text-secondary)' }}>流式输出</span>
+                  <Switch size="small" checked={useStream} onChange={setUseStream} />
+                </div>
+                <Button size="small" onClick={() => setHistoryDrawerOpen(true)}>历史对话</Button>
+                <Dropdown
+                  menu={{
+                    items: [
+                      { key: 'params', label: '模型参数', icon: <SettingOutlined />, onClick: () => setParamsDrawerOpen(true) },
+                      { key: 'mcp', label: 'MCP 资源', icon: <ApiOutlined />, onClick: () => setMcpDrawerOpen(true) },
+                      { key: 'edit', label: '管理 Agent', icon: <EditOutlined />, onClick: () => navigate(`/agents/${id}`) },
+                      { type: 'divider' },
+                      { key: 'clear', label: '清空对话', icon: <DeleteOutlined />, danger: true, onClick: () => {
+                          Modal.confirm({
+                            title: '清空当前会话所有消息？',
+                            onOk: handleClear
+                          });
+                        }
+                      }
+                    ]
+                  }}
+                >
+                  <Button size="small">更多 <DownOutlined /></Button>
+                </Dropdown>
+              </Space>
             </div>
 
             {/* Body */}
@@ -780,6 +764,8 @@ export default function ChatPage() {
             AI 可能会产生错误信息，请核实重要信息。
           </div>
         </div>
+          </>
+        )}
       </section>
 
       {/* ---- 抽屉组件保持不变 ---- */}
@@ -893,6 +879,28 @@ export default function ChatPage() {
           🔄 全部恢复默认
         </Button>
       </Drawer>
+
+      <Drawer
+        title="历史对话"
+        placement="right"
+        width={320}
+        onClose={() => setHistoryDrawerOpen(false)}
+        open={historyDrawerOpen}
+        bodyStyle={{ padding: 0 }}
+      >
+        {id && (
+          <SessionSidebar
+            agentId={id}
+            activeSessionId={sessionId}
+            onChange={(sid, opts) => {
+              setSessionId(sid);
+              setHighlightId(opts?.highlightMessageId || null);
+              setHistoryDrawerOpen(false);
+            }}
+            refreshTick={sessionRefresh}
+          />
+        )}
+      </Drawer>
     </div>
   );
 }