feat(auth): connect Flutter login to MSAL

eme-frontend/lib/screens/home_screen.dart

@@ -14,10 +14,19 @@ import "restitution_select_screen.dart";
 class HomeScreen extends StatelessWidget {
   const HomeScreen({super.key});
 
-  void _quitter(BuildContext context) {
-    AuthService.clearSession();
+  Future<void> _quitter(BuildContext context) async {
+    try {
+      await AuthService.signOut();
+      if (context.mounted) {
         Navigator.of(context).pop();
       }
+    } catch (error) {
+      if (!context.mounted) return;
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(error.toString())));
+    }
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -48,7 +57,7 @@ class HomeScreen extends StatelessWidget {
                       campusTag: DemoIdentity.campusTag,
                       userName: DemoIdentity.userName,
                       userInitials: DemoIdentity.userInitials,
-                      onBack: () => _quitter(context),
+                      onBack: () async => _quitter(context),
                     ),
                     Expanded(
                       child: SingleChildScrollView(

eme-frontend/lib/screens/login_screen.dart

@@ -1,6 +1,7 @@
 import "package:flutter/material.dart";
 import "package:google_fonts/google_fonts.dart";
 import "../demo_identity.dart";
+import "../services/api_client.dart";
 import "../services/auth_service.dart";
 import "../theme/ensup_colors.dart";
 import "../widgets/ensup_top_bar.dart";
@@ -10,11 +11,17 @@ import "home_screen.dart";
 import "responsable_screen.dart";
 
 /// Écran de démarrage : identification de l'étudiant (RG01/RG02).
-class LoginScreen extends StatelessWidget {
+class LoginScreen extends StatefulWidget {
   const LoginScreen({super.key});
 
-  void _identifier(BuildContext context) {
-    AuthService.selectDemoStudent();
+  @override
+  State<LoginScreen> createState() => _LoginScreenState();
+}
+
+class _LoginScreenState extends State<LoginScreen> {
+  bool _connexionEnCours = false;
+
+  void _ouvrirEtudiant() {
     Navigator.of(context).push(
       MaterialPageRoute(
         builder: (_) => const HomeScreen(),
@@ -23,8 +30,7 @@ class LoginScreen extends StatelessWidget {
     );
   }
 
-  void _identifierResponsable(BuildContext context) {
-    AuthService.selectDemoResponsable();
+  void _ouvrirResponsable() {
     Navigator.of(context).push(
       MaterialPageRoute(
         builder: (_) => const ResponsableScreen(),
@@ -33,6 +39,83 @@ class LoginScreen extends StatelessWidget {
     );
   }
 
+  void _identifierParQr() {
+    if (_connexionEnCours) return;
+    if (AuthService.mode == AuthenticationMode.azure) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text(
+            "L'identification QR securisee n'est pas encore configuree.",
+          ),
+        ),
+      );
+      return;
+    }
+
+    AuthService.selectDemoStudent();
+    _ouvrirEtudiant();
+  }
+
+  Future<void> _connecterMicrosoft({required bool responsableDemo}) async {
+    if (_connexionEnCours) return;
+
+    setState(() => _connexionEnCours = true);
+    try {
+      if (AuthService.mode == AuthenticationMode.demo) {
+        if (responsableDemo) {
+          AuthService.selectDemoResponsable();
+          _ouvrirResponsable();
+        } else {
+          AuthService.selectDemoStudent();
+          _ouvrirEtudiant();
+        }
+        return;
+      }
+
+      await AuthService.signInWithMicrosoft();
+      final reponse = await ApiClient.get("/auth/me");
+      final roleCode = _roleCode(reponse);
+      if (!mounted) return;
+
+      switch (roleCode) {
+        case "ETUDIANT":
+          _ouvrirEtudiant();
+        case "RESPONSABLE":
+          _ouvrirResponsable();
+        default:
+          throw StateError("Role utilisateur non autorise.");
+      }
+    } catch (error) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(error.toString())));
+    } finally {
+      if (mounted) {
+        setState(() => _connexionEnCours = false);
+      }
+    }
+  }
+
+  String _roleCode(dynamic reponse) {
+    if (reponse is! Map || reponse["data"] is! Map) {
+      throw StateError("Profil utilisateur invalide.");
+    }
+
+    final data = reponse["data"] as Map;
+    if (data["role"] is! Map) {
+      throw StateError("Role utilisateur absent.");
+    }
+
+    final role = data["role"] as Map;
+    final code = role["code"];
+    if (code is! String) {
+      throw StateError("Role utilisateur invalide.");
+    }
+
+    return code;
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -134,7 +217,9 @@ class LoginScreen extends StatelessWidget {
                                     label: "Scanner ma carte étudiante",
                                     description:
                                         "Présentez votre carte étudiante dématérialisée à la douchette ou à la tablette",
-                                    onTap: () => _identifier(context),
+                                    onTap: _connexionEnCours
+                                        ? null
+                                        : _identifierParQr,
                                   ),
                                   const SizedBox(height: 12),
                                   IdentificationOption(
@@ -144,7 +229,11 @@ class LoginScreen extends StatelessWidget {
                                         "Connexion compte professionnel ENSUP",
                                     description:
                                         "Utiliser mon adresse e-mail Microsoft 365",
-                                    onTap: () => _identifier(context),
+                                    onTap: _connexionEnCours
+                                        ? null
+                                        : () => _connecterMicrosoft(
+                                            responsableDemo: false,
+                                          ),
                                   ),
                                   const SizedBox(height: 20),
                                   Row(
@@ -173,8 +262,11 @@ class LoginScreen extends StatelessWidget {
                                   SizedBox(
                                     width: double.infinity,
                                     child: OutlinedButton.icon(
-                                      onPressed: () =>
-                                          _identifierResponsable(context),
+                                      onPressed: _connexionEnCours
+                                          ? null
+                                          : () => _connecterMicrosoft(
+                                              responsableDemo: true,
+                                            ),
                                       icon: const Icon(
                                         Icons.person_outline,
                                         size: 16,

eme-frontend/lib/screens/responsable_screen.dart

@@ -45,10 +45,19 @@ class _ResponsableScreenState extends State<ResponsableScreen> {
     setState(() => _future = _charger());
   }
 
-  void _quitter() {
-    AuthService.clearSession();
+  Future<void> _quitter() async {
+    try {
+      await AuthService.signOut();
+      if (mounted) {
         Navigator.of(context).pop();
       }
+    } catch (error) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(error.toString())));
+    }
+  }
 
   Future<void> _changerStatut(Map<String, dynamic> anomalie) async {
     final prochain = _prochainStatut(anomalie["statut"] as String?);