fix

management/src/api.ts

@@ -722,6 +722,21 @@ export const apiFetchOnlineStudents = async (rkId: number): Promise<{ onlineStud
   return res.json();
 };
 
+export interface ScheduleConflictItem {
+  studentRkId: number;
+  fullName: string;
+  studentCode: string;
+  conflictClassRkId: number;
+  conflictClassName: string;
+  conflictClassCode: string;
+}
+
+export const apiFetchScheduleConflicts = async (rkId: number): Promise<{ conflicts: ScheduleConflictItem[]; ok: boolean }> => {
+  const res = await staffFetch(`/classes/${rkId}/schedule-conflicts`);
+  if (!res.ok) throw new Error('Failed to check schedule conflicts');
+  return res.json();
+};
+
 export const apiFetchClassCourses = async (rkId: number): Promise<{
   data: ClassCourseItem[];
   source?: string;