fix(admin): UX improvements — silent fetch failures, empty states, batch loading guards, dashboard refresh

- Replace console.error-only catches with message.error user-facing notifications
  across Bills, Classes, ClassroomRentals, ClassroomSchedule, Classrooms, Deposits,
  Expenses, OperationLogs, Permissions, Roles, RoomVisual, Rooms, Students,
  Tenants, Users
- Add Empty component via Table locale prop on list pages: Bills, Classes,
  ClassroomRentals, Classrooms, Deposits, Expenses (room+personal), Occupancies,
  Rooms, Students, Tenants, Roles
- Add batchLoading state to batch delete/update operations: Bills (batchDelete,
  batchUpdateStatus), Expenses (batchDeleteRoom, batchDeletePersonal),
  Occupancies (batchCheckOut, batchDelete), Rooms (batchDelete),
  Students (batchDelete)
- Add refreshLoading indicator to Dashboard header when re-fetching data
- Consistent error pattern: catch (e: unknown) { const err = e as { message?: string }; message.error(...); }

apps/admin/src/pages/ClassroomRentals/index.tsx

@@ -14,6 +14,7 @@ import {
   Popconfirm,
   Upload,
   Tooltip,
+  Empty,
 } from 'antd';
 import { PlusOutlined, UploadOutlined, DeleteOutlined, FileTextOutlined } from '@ant-design/icons';
 import dayjs, { Dayjs } from 'dayjs';
@@ -50,8 +51,8 @@ const ClassroomRentalsPage: React.FC = () => {
       if (filterMonth) params.month = filterMonth.format('YYYY-MM');
       const res: any = await api.get('/classroom-rentals', { params });
       setData(res);
-    } catch (e) {
-      console.error(e);
+    } catch (e: any) {
+      message.error(e?.message || '加载失败，请稍后重试');
     }
     setLoading(false);
   };
@@ -61,8 +62,8 @@ const ClassroomRentalsPage: React.FC = () => {
       const [cr, tn]: any = await Promise.all([api.get('/classrooms'), api.get('/tenants')]);
       setClassrooms(cr);
       setTenants(tn);
-    } catch (e) {
-      console.error(e);
+    } catch (e: any) {
+      message.error(e?.message || '加载教室列表失败');
     }
   };
 
@@ -311,10 +312,10 @@ const ClassroomRentalsPage: React.FC = () => {
         dataSource={filteredData}
         rowKey="id"
         loading={loading}
+        locale={{ emptyText: <Empty description="暂无数据" /> }}
         pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
         scroll={{ x: 1200 }}
       />
-
       <Modal
         title={editing ? '编辑租赁' : '新增租赁'}
         open={modalOpen}