fixed several page and teacher page creation

lib/widgets/app_drawer.dart

@@ -10,6 +10,8 @@ import '../screens/lessons_page.dart';
 import '../screens/orders_detail_page.dart';
 import '../screens/account_page.dart';
 import '../screens/settings_page.dart';
+import '../screens/teacher_panel_page.dart';
+import '../services/role_service.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 class AppDrawer extends StatelessWidget {
@@ -95,6 +97,50 @@ class AppDrawer extends StatelessWidget {
               fallbackLetter: _avatarLetter,
             ),
 
+            // Sezione insegnante: visibile solo a staff (Admin/teacher).
+            FutureBuilder<UserRole>(
+              future: RoleService.fetchMyRole(token: token),
+              builder: (context, snap) {
+                final isStaff = snap.data?.isStaff ?? false;
+                if (!isStaff) return const SizedBox.shrink();
+                return Column(
+                  children: [
+                    Container(
+                      width: double.infinity,
+                      padding: const EdgeInsets.fromLTRB(16, 10, 16, 4),
+                      child: const Text(
+                        'INSEGNANTE',
+                        style: TextStyle(
+                          fontSize: 11,
+                          fontWeight: FontWeight.w900,
+                          color: Color(0xFF10B981),
+                          letterSpacing: 0.5,
+                        ),
+                      ),
+                    ),
+                    ListTile(
+                      leading: const Icon(Icons.calendar_month_rounded),
+                      title: const Text('Pannello classi'),
+                      onTap: () {
+                        Navigator.of(context).pop();
+                        Navigator.push(
+                          context,
+                          MaterialPageRoute(
+                            builder: (_) => TeacherPanelPage(
+                              token: token,
+                              school: school,
+                              userFirstName: userFirstName,
+                            ),
+                          ),
+                        );
+                      },
+                    ),
+                    const Divider(height: 1),
+                  ],
+                );
+              },
+            ),
+
             ListTile(
               leading: const Icon(Icons.medical_information),
               title: const Text('Certificati medici'),