feat(#112): reprise après refus via lien e-mail (/reprise?token=)

Branche le flux front : chargement du dossier, session reprise, wizards
parent/AM préremplis et resoumission via reprise-resoumettre.

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

frontend/lib/screens/auth/parent_register_step5_screen.dart

@@ -14,6 +14,7 @@ import '../../widgets/personal_info_form_screen.dart';
 import '../../widgets/child_card_widget.dart';
 import '../../widgets/presentation_form_screen.dart';
 import '../../services/auth_service.dart';
+import '../../services/reprise_session.dart';
 
 class ParentRegisterStep5Screen extends StatefulWidget {
   const ParentRegisterStep5Screen({super.key});
@@ -27,8 +28,39 @@ class _ParentRegisterStep5ScreenState extends State<ParentRegisterStep5Screen> {
 
   Future<void> _submitRegistration(BuildContext context, UserRegistrationData data) async {
     if (_isSubmitting) return;
+    if (RepriseSession.isActive) {
+      if (!data.isRepriseSubmitReady) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text(
+              'Vérifiez vos coordonnées et acceptez les conditions.',
+              style: GoogleFonts.merienda(fontSize: 14),
+            ),
+            backgroundColor: Colors.red.shade700,
+          ),
+        );
+        return;
+      }
+    }
     setState(() => _isSubmitting = true);
     try {
+      if (RepriseSession.isActive) {
+        final token = RepriseSession.token!;
+        final p = data.parent1;
+        await AuthService.resoumettreReprise(
+          token: token,
+          prenom: p.firstName,
+          nom: p.lastName,
+          telephone: p.phone,
+          adresse: p.address,
+          ville: p.city,
+          codePostal: p.postalCode,
+        );
+        RepriseSession.clear();
+        if (!context.mounted) return;
+        _showRepriseSuccessModal(context);
+        return;
+      }
       await AuthService.registerParent(data);
       if (!context.mounted) return;
       _showSuccessModal(context);
@@ -279,6 +311,34 @@ class _ParentRegisterStep5ScreenState extends State<ParentRegisterStep5Screen> {
     );
   }
 
+  void _showRepriseSuccessModal(BuildContext context) {
+    showDialog<void>(
+      context: context,
+      barrierDismissible: false,
+      builder: (BuildContext dialogContext) {
+        return AlertDialog(
+          title: Text(
+            'Dossier resoumis',
+            style: GoogleFonts.merienda(fontWeight: FontWeight.bold),
+          ),
+          content: Text(
+            'Vos modifications ont été enregistrées. Votre dossier est de nouveau en attente de validation.',
+            style: GoogleFonts.merienda(fontSize: 14),
+          ),
+          actions: <Widget>[
+            TextButton(
+              child: Text('OK', style: GoogleFonts.merienda(fontWeight: FontWeight.bold)),
+              onPressed: () {
+                Navigator.of(dialogContext).pop();
+                context.go('/login');
+              },
+            ),
+          ],
+        );
+      },
+    );
+  }
+
   void _showSuccessModal(BuildContext context) {
     showDialog<void>(
       context: context,