fix: type error in dashboard ClassroomUtilStats

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

@@ -21,6 +21,7 @@ const COLORS = [
 interface BillStatRow { status: string; count: string; total: string }
 interface ClassAttendanceRank { className: string; present: number; total: number; rate: number }
 interface ClassroomOccupancy { name: string; building: string; capacity: number; scheduleDays: number; rentalCount: number; occupancy: number }
+interface ClassroomUtilStats { totalClassrooms: number; inUseCount: number; utilizationRate: string; scheduleCount: number; rentalCount: number }
 interface AttendanceTrendRow { date: string; rate: string }
 interface IncomeTrendRow { month: string; amount: number }
 interface OccupancyByBuildingRow { building: string; count: string }
@@ -69,13 +70,7 @@ const DashboardPage: React.FC = () => {
   const [classroomOccupancy, setClassroomOccupancy] = useState<ClassroomOccupancy[]>([]);
   const [ganttData, setGanttData] = useState<GanttRoom[]>([]);
   const [roomRanking, setRoomRanking] = useState<Array<{ roomNumber: string; total: string }>>([]);
-  const [classroomUtil, setClassroomUtil] = useState<{
-    totalClassrooms: number;
-    inUseCount: number;
-    utilizationRate: string;
-    scheduleCount: number;
-    rentalCount: number;
-  } | null>(null);
+  const [classroomUtil, setClassroomUtil] = useState<ClassroomUtilStats | null>(null);
   const [loading, setLoading] = useState(true);
   const [period, setPeriod] = useState<[string, string]>([
     dayjs().startOf('month').format('YYYY-MM-DD'),
@@ -101,7 +96,7 @@ const DashboardPage: React.FC = () => {
       setGanttData(g);
       const co = await api.get<ClassroomOccupancy[]>('/dashboard/classroom-occupancy');
       setClassroomOccupancy(co);
-      const cu = await api.get('/dashboard/classroom-utilization');
+      const cu = await api.get<ClassroomUtilStats>('/dashboard/classroom-utilization');
       setClassroomUtil(cu);
     } catch (e) {
       console.error(e);