feat: add absence notification and analytics features

- Implemented AbsenceNotifyView for notifying absence with session details.
- Created AnalyticsView for displaying group analytics and managing students at risk.
- Added ClassAttendanceView for marking attendance in classes.
- Defined new schemas for analytics and attendance in shared package.

packages/shared/src/schemas/home.ts

@@ -15,6 +15,8 @@ const timeZoneSchema = z
     }
   }, 'Zona horaria IANA inválida');
 
+export { timeZoneSchema };
+
 export const HomeStatsSchema = z.object({
   groups: z.number().int().nonnegative(),
   attendees: z.number().int().nonnegative(),