feat(#129): wizard admin création dossier famille (create/review).

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

frontend/lib/widgets/admin/user_management_panel.dart

@@ -8,6 +8,7 @@ import 'package:p_tits_pas/widgets/admin/common/admin_child_detail_modal.dart';
 import 'package:p_tits_pas/widgets/admin/dashboard_admin.dart';
 import 'package:p_tits_pas/widgets/admin/enfant_management_widget.dart';
 import 'package:p_tits_pas/widgets/admin/gestionnaire_management_widget.dart';
+import 'package:p_tits_pas/widgets/admin/parent_dossier_create_modal.dart';
 import 'package:p_tits_pas/widgets/admin/parent_managmant_widget.dart';
 import 'package:p_tits_pas/widgets/admin/pending_validation_widget.dart';
 
@@ -27,6 +28,7 @@ class UserManagementPanel extends StatefulWidget {
 class _UserManagementPanelState extends State<UserManagementPanel> {
   int _subIndex = 0;
   int _gestionnaireRefreshTick = 0;
+  int _parentRefreshTick = 0;
   int _adminRefreshTick = 0;
   int _enfantRefreshTick = 0;
   int _amRefreshTick = 0;
@@ -263,6 +265,7 @@ class _UserManagementPanelState extends State<UserManagementPanel> {
     switch (contentIndex) {
       case 0:
         return ParentManagementWidget(
+          key: ValueKey('parents-$_parentRefreshTick'),
           searchQuery: _searchController.text,
           statusFilter: _parentStatus,
         );
@@ -318,6 +321,24 @@ class _UserManagementPanelState extends State<UserManagementPanel> {
   Future<void> _handleAddPressed() async {
     final contentIndex = _subIndex - _contentIndexOffset;
 
+    if (contentIndex == 0) {
+      await showDialog<void>(
+        context: context,
+        barrierDismissible: false,
+        builder: (dialogContext) {
+          return ParentDossierCreateModal(
+            onClose: () => Navigator.of(dialogContext).pop(),
+            onSuccess: () {
+              Navigator.of(dialogContext).pop();
+              if (!mounted) return;
+              setState(() => _parentRefreshTick++);
+            },
+          );
+        },
+      );
+      return;
+    }
+
     if (contentIndex == 1) {
       await showDialog<void>(
         context: context,