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/Bills/index.tsx

@@ -13,6 +13,7 @@ import {
   Select,
   Tooltip,
   Spin,
+  Empty,
 } from 'antd';
 import {
   FileTextOutlined,
@@ -54,6 +55,7 @@ const BillsPage: React.FC = () => {
   const [generateForm] = Form.useForm();
   const [saving, setSaving] = useState(false);
   const [detailLoading, setDetailLoading] = useState(false);
+  const [batchLoading, setBatchLoading] = useState(false);
 
   const fetchData = useCallback(async () => {
     setLoading(true);
@@ -63,8 +65,8 @@ const BillsPage: React.FC = () => {
       if (filterExpenseType) params.expenseType = filterExpenseType;
       const res = await api.get('/bills', { params }) as unknown[];
       setBills(res);
-    } catch (e) {
-      console.error(e);
+    } catch (e: any) {
+      message.error(e?.message || '加载失败，请稍后重试');
     }
     setLoading(false);
   }, [filterStatus, filterExpenseType]);
@@ -110,8 +112,9 @@ const BillsPage: React.FC = () => {
     try {
       const res = await api.get(`/bills/${id}`);
       setDetailModal(res);
-    } catch (e) {
-      console.error(e);
+    } catch (e: any) {
+      message.error(e?.message || '加载详情失败');
+    }
     } finally {
       setDetailLoading(false);
     }
@@ -132,6 +135,7 @@ const BillsPage: React.FC = () => {
 
   const batchUpdateStatus = async (status: string) => {
     if (selectedRows.length === 0) return message.warning('请先选择账单');
+    setBatchLoading(true);
     try {
       await api.put('/bills/batch/status', { ids: selectedRows, status });
       message.success(`已批量更新 ${selectedRows.length} 条账单`);
@@ -139,6 +143,8 @@ const BillsPage: React.FC = () => {
       fetchData();
     } catch (e: any) {
       message.error(e?.message || '操作失败');
+    } finally {
+      setBatchLoading(false);
     }
   };
 
@@ -151,9 +157,9 @@ const BillsPage: React.FC = () => {
       message.error(e?.message || '删除失败');
     }
   };
-
   const batchDelete = async () => {
     if (selectedRows.length === 0) return message.warning('请先选择账单');
+    setBatchLoading(true);
     try {
       await api.post('/bills/batch/delete', { ids: selectedRows });
       message.success(`已删除 ${selectedRows.length} 条账单`);
@@ -161,6 +167,8 @@ const BillsPage: React.FC = () => {
       fetchData();
     } catch (e: any) {
       message.error(e?.message || '操作失败');
+    } finally {
+      setBatchLoading(false);
     }
   };
 
@@ -334,6 +342,7 @@ const BillsPage: React.FC = () => {
             permission="bill:confirm"
             onClick={() => batchUpdateStatus('confirmed')}
             disabled={selectedRows.length === 0}
+            loading={batchLoading}
           >
             批量确认
           </PermissionButton>
@@ -342,6 +351,7 @@ const BillsPage: React.FC = () => {
             type="primary"
             onClick={() => batchUpdateStatus('paid')}
             disabled={selectedRows.length === 0}
+            loading={batchLoading}
           >
             批量标记已付
           </PermissionButton>
@@ -357,6 +367,7 @@ const BillsPage: React.FC = () => {
               danger
               disabled={selectedRows.length === 0}
               icon={<DeleteOutlined />}
+              loading={batchLoading}
             >
               批量删除
             </PermissionButton>
@@ -389,6 +400,7 @@ const BillsPage: React.FC = () => {
         dataSource={filteredBills}
         rowKey="id"
         loading={loading}
+        locale={{ emptyText: <Empty description="暂无数据" /> }}
         pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 条` }}
         rowSelection={{
           selectedRowKeys: selectedRows,