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/authApi.js

@@ -5,5 +5,6 @@ export const authApi = {
   login: (data) => axiosInstance.post('/auth/login', data),
   refresh: (refreshToken) => axiosInstance.post('/auth/refresh', { refreshToken }),
   logout: (refreshToken) => axiosInstance.post('/auth/logout', { refreshToken }),
+  changePassword: (data) => axiosInstance.put('/auth/change-password', data),
   getSelf: () => axiosInstance.get('/users/user/get-self')
 };