Add attendance hub, categorized sidebar, and UI preferences page.

Improve dashboard and navigation access to attendance, group the right-side menu by category, and let each account save default theme and font size.

src/api/authApi.js

@@ -6,5 +6,6 @@ export const authApi = {
   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')
+  getSelf: () => axiosInstance.get('/users/user/get-self'),
+  updateSelf: (data) => axiosInstance.put('/users/user/update-self', data)
 };