feat(#44): dashboard gestionnaire + redirection login rôle gestionnaire

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/config/app_router.dart

@@ -20,6 +20,7 @@ import '../screens/auth/am_register_step3_screen.dart';
 import '../screens/auth/am_register_step4_screen.dart';
 import '../screens/home/home_screen.dart';
 import '../screens/administrateurs/admin_dashboardScreen.dart';
+import '../screens/gestionnaire/gestionnaire_dashboard_screen.dart';
 import '../screens/home/parent_screen/ParentDashboardScreen.dart';
 import '../screens/unknown_screen.dart';
 
@@ -53,6 +54,10 @@ class AppRouter {
         path: '/admin-dashboard',
         builder: (BuildContext context, GoRouterState state) => const AdminDashboardScreen(),
       ),
+      GoRoute(
+        path: '/gestionnaire-dashboard',
+        builder: (BuildContext context, GoRouterState state) => const GestionnaireDashboardScreen(),
+      ),
       GoRoute(
         path: '/parent-dashboard',
         builder: (BuildContext context, GoRouterState state) => const ParentDashboardScreen(),

frontend/lib/screens/auth/login_screen.dart

@@ -131,9 +131,11 @@ class _LoginPageState extends State<LoginScreen> with WidgetsBindingObserver {
     switch (role.toLowerCase()) {
       case 'super_admin':
       case 'administrateur':
-      case 'gestionnaire':
         context.go('/admin-dashboard');
         break;
+      case 'gestionnaire':
+        context.go('/gestionnaire-dashboard');
+        break;
       case 'parent':
         context.go('/parent-dashboard');
         break;

frontend/lib/screens/gestionnaire/gestionnaire_dashboard_screen.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:p_tits_pas/widgets/admin/dashboard_admin.dart';
+import 'package:p_tits_pas/widgets/admin/user_management_panel.dart';
+import 'package:p_tits_pas/widgets/app_footer.dart';
+
+/// Dashboard gestionnaire – même shell que l'admin, sans onglet Paramètres.
+/// Réutilise [AdminUserManagementPanel].
+class GestionnaireDashboardScreen extends StatefulWidget {
+  const GestionnaireDashboardScreen({super.key});
+
+  @override
+  State<GestionnaireDashboardScreen> createState() =>
+      _GestionnaireDashboardScreenState();
+}
+
+class _GestionnaireDashboardScreenState extends State<GestionnaireDashboardScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: PreferredSize(
+        preferredSize: const Size.fromHeight(60.0),
+        child: Container(
+          decoration: BoxDecoration(
+            border: Border(
+              bottom: BorderSide(color: Colors.grey.shade300),
+            ),
+          ),
+          child: DashboardAppBarAdmin(
+            selectedIndex: 0,
+            onTabChange: (_) {},
+            showSettingsTab: false,
+            roleLabel: 'Gestionnaire',
+            setupCompleted: true,
+          ),
+        ),
+      ),
+      body: Column(
+        children: [
+          const Expanded(child: AdminUserManagementPanel()),
+          const AppFooter(),
+        ],
+      ),
+    );
+  }
+}

frontend/lib/widgets/admin/dashboard_admin.dart

@@ -3,17 +3,22 @@ import 'package:go_router/go_router.dart';
 import 'package:p_tits_pas/services/auth_service.dart';
 
 /// Barre du dashboard admin : onglets Gestion des utilisateurs | Paramètres + déconnexion.
+/// Pour le dashboard gestionnaire : [showSettingsTab] = false, [roleLabel] = 'Gestionnaire'.
 class DashboardAppBarAdmin extends StatelessWidget
     implements PreferredSizeWidget {
   final int selectedIndex;
   final ValueChanged<int> onTabChange;
   final bool setupCompleted;
+  final bool showSettingsTab;
+  final String roleLabel;
 
   const DashboardAppBarAdmin({
     Key? key,
     required this.selectedIndex,
     required this.onTabChange,
     this.setupCompleted = true,
+    this.showSettingsTab = true,
+    this.roleLabel = 'Admin',
   }) : super(key: key);
 
   @override
@@ -39,8 +44,10 @@ class DashboardAppBarAdmin extends StatelessWidget
                 children: [
                   _buildNavItem(context, 'Gestion des utilisateurs', 0,
                       enabled: setupCompleted),
-                  const SizedBox(width: 24),
-                  _buildNavItem(context, 'Paramètres', 1, enabled: true),
+                  if (showSettingsTab) ...[
+                    const SizedBox(width: 24),
+                    _buildNavItem(context, 'Paramètres', 1, enabled: true),
+                  ],
                 ],
               ),
             ),
@@ -48,12 +55,12 @@ class DashboardAppBarAdmin extends StatelessWidget
         ],
       ),
       actions: [
-        const Padding(
-          padding: EdgeInsets.symmetric(horizontal: 16),
+        Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 16),
           child: Center(
             child: Text(
-              'Admin',
-              style: TextStyle(
+              roleLabel,
+              style: const TextStyle(
                 color: Colors.black,
                 fontSize: 16,
                 fontWeight: FontWeight.w500,