correções nas turmas e disciplinas

lib/core/services/auth_service.dart

@@ -90,6 +90,20 @@ class AuthService {
     }
   }
 
+  /// Ler schoolClassId do aluno na Firestore (turma escolar definida no registo)
+  static Future<String?> getStudentSchoolClassId(String uid) async {
+    try {
+      final doc = await _firestore.collection('users').doc(uid).get();
+      if (doc.exists) {
+        return doc.data()?['schoolClassId'] as String?;
+      }
+      return null;
+    } catch (e) {
+      print('DEBUG: Erro ao ler schoolClassId: $e');
+      return null;
+    }
+  }
+
   /// Ler role do usuário na Firestore
   static Future<String?> getUserRole(String uid) async {
     try {