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/Students/index.tsx

@@ -17,6 +17,7 @@ import {
   Card,
   Drawer,
   Descriptions,
+  Empty,
 } from 'antd';
 import {
   PlusOutlined,
@@ -72,6 +73,7 @@ const StudentsPage: React.FC = () => {
   const [showArchived, setShowArchived] = useState(false);
   const [archivedCount, setArchivedCount] = useState(0);
   const [selectedRowKeys, setSelectedRowKeys] = useState<number[]>([]);
+  const [batchLoading, setBatchLoading] = useState(false);
   const [enrollmentData, setEnrollmentData] = useState<Record<number, EnrollmentInfo[]>>({});
   const [drawerOpen, setDrawerOpen] = useState(false);
   const [drawerStudentId, setDrawerStudentId] = useState<number | undefined>(undefined);
@@ -111,6 +113,7 @@ const StudentsPage: React.FC = () => {
   };
 
   const handleBatchDelete = async () => {
+    setBatchLoading(true);
     try {
       const res: any = await api.post('/students/batch-delete', { ids: selectedRowKeys });
       message.success(res?.message || `已批量归档 ${selectedRowKeys.length} 人`);
@@ -118,6 +121,8 @@ const StudentsPage: React.FC = () => {
       fetchData();
     } catch (e: any) {
       message.error(e?.message || '批量归档失败');
+    } finally {
+      setBatchLoading(false);
     }
   };
 
@@ -132,8 +137,9 @@ const StudentsPage: React.FC = () => {
       const archived = list.filter((r) => r.status === 'archived');
       setArchivedCount(archived.length);
       setData(showArchived ? list : list.filter((r) => r.status !== 'archived'));
-    } 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);
   }, [searchName, showArchived, filterStatus, filterTenantId]);
@@ -383,6 +389,7 @@ const StudentsPage: React.FC = () => {
               danger
               icon={<DeleteOutlined />}
               disabled={selectedRowKeys.length === 0}
+              loading={batchLoading}
             >
               批量归档
             </PermissionButton>
@@ -441,6 +448,7 @@ const StudentsPage: React.FC = () => {
         dataSource={data}
         rowKey="id"
         loading={loading}
+        locale={{ emptyText: <Empty description="暂无数据" /> }}
         scroll={{ x: 1410 }}
         pagination={{ pageSize: 15, showTotal: (total) => `共 ${total} 人` }}
         rowClassName={(record: any) => (record.status === 'archived' ? 'archived-row' : '')}