feat(features): refontes adhesions/admin/auth/backup/contributions/dashboard/epargne/events

- adhesions : bloc complet avec events/states/model, dialogs paiement/rejet
- admin : users bloc, user management list/detail pages
- authentication : bloc + keycloak auth service + webview
- backup : bloc complet, repository, models
- contributions : bloc + widgets + export
- dashboard : widgets connectés (activities, events, notifications, search)
  + charts + monitoring + shortcuts
- epargne : repository, transactions, dialogs
- events : bloc complet, pages (detail, connected, wrapper), models

lib/features/epargne/presentation/pages/epargne_detail_page.dart

@@ -181,11 +181,9 @@ class _EpargneDetailPageState extends State<EpargneDetailPage> {
     final actif = c.statut == 'ACTIF';
 
     return Scaffold(
-      appBar: AppBar(
-        title: const Text('Détail du compte'),
-        backgroundColor: Colors.transparent,
-        elevation: 0,
-        foregroundColor: ColorTokens.onSurface,
+      appBar: UFAppBar(
+        title: 'Détail du compte',
+        moduleGradient: ModuleColors.epargneGradient,
         actions: [
           IconButton(
             icon: const Icon(Icons.history),
@@ -197,7 +195,7 @@ class _EpargneDetailPageState extends State<EpargneDetailPage> {
       body: Container(
         width: double.infinity,
         decoration: const BoxDecoration(
-          color: AppColors.lightBackground,
+          color: AppColors.background,
         ),
         child: SafeArea(
           child: RefreshIndicator(