feat: add profile, class unenroll, notify toggles, and keep sidebar width

Give admins a profile password page, class removal, and SMS/email/bot checkboxes, and stop the sidebar from shrinking on edit pages.

src/api/classApi.js

@@ -8,5 +8,8 @@ export const classApi = {
   create: (data) => axiosInstance.post('/classes/admin/create', data),
   update: (id, data) => axiosInstance.put(`/classes/admin/update/${id}`, data),
   delete: (id) => axiosInstance.delete(`/classes/admin/delete/${id}`),
-  registerUsers: (classId, userIds) => axiosInstance.post(`/classes/admin/${classId}/register-users`, { userIds })
+  registerUsers: (classId, userIds, notify) =>
+    axiosInstance.post(`/classes/admin/${classId}/register-users`, { userIds, notify }),
+  removeUser: (classId, userId) =>
+    axiosInstance.delete(`/classes/admin/${classId}/students/${userId}`)
 };