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/RoomVisual/index.tsx

@@ -1,5 +1,5 @@
 import React, { useEffect, useState, useCallback } from 'react';
-import { Row, Col, Card, Tag, Select, Statistic, Modal, Spin, Badge, Tooltip, DatePicker, Alert, Button } from 'antd';
+import { Row, Col, Card, Tag, Select, Statistic, Modal, Spin, Badge, Tooltip, DatePicker, Alert, Button, message } from 'antd';
 import { HomeOutlined, UserOutlined, CalendarOutlined, BankOutlined, HistoryOutlined, ShopOutlined } from '@ant-design/icons';
 import dayjs, { Dayjs } from 'dayjs';
 import api from '../../api';
@@ -64,8 +64,9 @@ const RoomVisualPage: React.FC = () => {
       const params = isHistorical ? { asOf: asOf!.format('YYYY-MM-DD') } : undefined;
       const res: any = await api.get('/rooms/visual', { params });
       setData(res);
-    } catch (e) {
-      console.error(e);
+    } catch (e: unknown) {
+      const err = e as { message?: string };
+      message.error(err?.message || '加载失败，请稍后重试');
     }
     setLoading(false);
   }, [isHistorical, asOf]);