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/OperationLogs/index.tsx

@@ -1,5 +1,5 @@
 import React, { useEffect, useState, useMemo, useCallback } from 'react';
-import { Table, Select, DatePicker, Space, Tag, Tooltip } from 'antd';
+import { Table, Select, DatePicker, Space, Tag, Tooltip, message } from 'antd';
 import dayjs from 'dayjs';
 import api from '../../api';
 
@@ -40,8 +40,9 @@ const OperationLogsPage: React.FC = () => {
       const res: any = await api.get('/operation-logs', { params });
       setData(res.data);
       setTotal(res.total);
-    } 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);
   }, [page, filterModule, dateRange]);