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/services/api/api_config.dart

@@ -49,6 +49,9 @@ class ApiConfig {
   /// Ticket #127 — mot de passe oublié (back à livrer en parallèle).
   static const String forgotPassword = '/auth/forgot-password';
   static const String resetPassword = '/auth/reset-password';
+  /// Ticket #112 — reprise après refus (#111 back).
+  static const String repriseDossier = '/auth/reprise-dossier';
+  static const String repriseResoumettre = '/auth/reprise-resoumettre';
 
   // Users endpoints
   static const String users = '/users';

frontend/lib/services/auth_service.dart

@@ -8,6 +8,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import '../models/user.dart';
 import '../models/am_registration_data.dart';
 import '../models/user_registration_data.dart';
+import '../models/reprise_dossier.dart';
 import '../utils/parent_registration_payload.dart';
 import 'api/api_config.dart';
 import 'api/tokenService.dart';
@@ -258,6 +259,91 @@ class AuthService {
     throw Exception(msg);
   }
 
+  /// Charge le dossier pour reprise (lien e-mail). GET /auth/reprise-dossier. Ticket #112.
+  static Future<RepriseDossier> getRepriseDossier(String token) async {
+    final cleaned = token.trim();
+    if (cleaned.isEmpty) {
+      throw Exception('Lien invalide ou expiré.');
+    }
+    final uri = Uri.parse(
+      '${ApiConfig.baseUrl}${ApiConfig.repriseDossier}',
+    ).replace(queryParameters: {'token': cleaned});
+    late final http.Response response;
+    try {
+      response = await http.get(uri, headers: ApiConfig.headers);
+    } on http.ClientException {
+      throw Exception(
+        'Connexion à ${ApiConfig.baseUrl} impossible. Vérifiez votre réseau puis réessayez.',
+      );
+    }
+    if (response.statusCode == 404) {
+      throw Exception('Lien invalide ou expiré.');
+    }
+    if (response.statusCode != 200) {
+      final decoded = _tryDecodeJsonMap(response.body);
+      throw Exception(_extractErrorMessage(decoded, response.statusCode));
+    }
+    final decoded = jsonDecode(response.body);
+    if (decoded is! Map<String, dynamic>) {
+      throw Exception('Réponse invalide du serveur.');
+    }
+    return RepriseDossier.fromJson(decoded);
+  }
+
+  /// Resoumission après refus. PATCH /auth/reprise-resoumettre. Ticket #112.
+  static Future<void> resoumettreReprise({
+    required String token,
+    String? prenom,
+    String? nom,
+    String? telephone,
+    String? adresse,
+    String? ville,
+    String? codePostal,
+    String? photoUrl,
+  }) async {
+    final cleaned = token.trim();
+    if (cleaned.isEmpty) {
+      throw Exception('Lien invalide ou expiré.');
+    }
+    final body = <String, dynamic>{'token': cleaned};
+    if (prenom != null && prenom.trim().isNotEmpty) body['prenom'] = prenom.trim();
+    if (nom != null && nom.trim().isNotEmpty) body['nom'] = nom.trim();
+    if (telephone != null && telephone.trim().isNotEmpty) {
+      body['telephone'] = telephone.trim();
+    }
+    if (adresse != null && adresse.trim().isNotEmpty) {
+      body['adresse'] = adresse.trim();
+    }
+    if (ville != null && ville.trim().isNotEmpty) body['ville'] = ville.trim();
+    if (codePostal != null && codePostal.trim().isNotEmpty) {
+      body['code_postal'] = codePostal.trim();
+    }
+    if (photoUrl != null && photoUrl.trim().isNotEmpty) {
+      body['photo_url'] = photoUrl.trim();
+    }
+
+    late final http.Response response;
+    try {
+      response = await http.patch(
+        Uri.parse('${ApiConfig.baseUrl}${ApiConfig.repriseResoumettre}'),
+        headers: ApiConfig.headers,
+        body: jsonEncode(body),
+      );
+    } on http.ClientException {
+      throw Exception(
+        'Connexion à ${ApiConfig.baseUrl} impossible. Vérifiez votre réseau puis réessayez.',
+      );
+    }
+    if (response.statusCode == 404) {
+      throw Exception('Lien invalide ou expiré.');
+    }
+    if (response.statusCode == 200 || response.statusCode == 201) {
+      return;
+    }
+    final decoded = _tryDecodeJsonMap(response.body);
+    throw Exception(_extractErrorMessage(decoded, response.statusCode));
+  }
+
   /// Déconnexion de l'utilisateur
   static Future<void> logout() async {
     await TokenService.clearAll();

frontend/lib/services/reprise_session.dart

@@ -0,0 +1,67 @@
+import 'package:p_tits_pas/models/am_registration_data.dart';
+import 'package:p_tits_pas/models/reprise_dossier.dart';
+import 'package:p_tits_pas/models/user_registration_data.dart';
+import 'package:p_tits_pas/services/api/api_config.dart';
+
+/// Contexte reprise après refus (token e-mail ou identify). Ticket #112.
+class RepriseSession {
+  RepriseSession._();
+
+  static String? _token;
+  static String? _role;
+  static String? _photoUrl;
+
+  static bool get isActive =>
+      _token != null && _token!.trim().isNotEmpty;
+
+  static String? get token => _token;
+
+  static bool get isParent => _role == 'parent';
+
+  static bool get isAm => _role == 'assistante_maternelle';
+
+  static String? get photoUrl => _photoUrl;
+
+  static void start({
+    required String token,
+    required RepriseDossier dossier,
+  }) {
+    _token = token.trim();
+    _role = dossier.role;
+    _photoUrl = dossier.photoUrl?.trim().isNotEmpty == true
+        ? ApiConfig.absoluteMediaUrl(dossier.photoUrl)
+        : null;
+  }
+
+  static void clear() {
+    _token = null;
+    _role = null;
+    _photoUrl = null;
+  }
+
+  static void applyToParent(UserRegistrationData data, RepriseDossier dossier) {
+    data.resetForReprise(
+      firstName: dossier.prenom ?? '',
+      lastName: dossier.nom ?? '',
+      phone: dossier.telephone ?? '',
+      email: dossier.email,
+      address: dossier.adresse ?? '',
+      postalCode: dossier.codePostal ?? '',
+      city: dossier.ville ?? '',
+    );
+  }
+
+  static void applyToAm(AmRegistrationData data, RepriseDossier dossier) {
+    final photo = _photoUrl;
+    data.resetForReprise(
+      firstName: dossier.prenom ?? '',
+      lastName: dossier.nom ?? '',
+      phone: dossier.telephone ?? '',
+      email: dossier.email,
+      streetAddress: dossier.adresse ?? '',
+      postalCode: dossier.codePostal ?? '',
+      city: dossier.ville ?? '',
+      existingPhotoUrl: photo,
+    );
+  }
+}