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/dashboard/presentation/pages/role_dashboards/consultant_dashboard.dart

@@ -17,7 +17,7 @@ class ConsultantDashboard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      backgroundColor: UnionFlowColors.background,
+      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
       appBar: _buildAppBar(context),
       drawer: DashboardDrawer(
         onLogout: () => context.read<AuthBloc>().add(const AuthLogoutRequested()),
@@ -205,8 +205,10 @@ class ConsultantDashboard extends StatelessWidget {
 
   PreferredSizeWidget _buildAppBar(BuildContext context) {
     return AppBar(
-      backgroundColor: UnionFlowColors.surface,
+      backgroundColor: Theme.of(context).colorScheme.surface,
       elevation: 0,
+      scrolledUnderElevation: 1,
+      shadowColor: Theme.of(context).colorScheme.outline.withOpacity(0.2),
       title: Row(
         children: [
           Container(
@@ -224,16 +226,16 @@ class ConsultantDashboard extends StatelessWidget {
             child: const Text('C', style: TextStyle(color: Colors.white, fontWeight: FontWeight.w900, fontSize: 18)),
           ),
           const SizedBox(width: 12),
-          const Column(
+          Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
-              Text('UnionFlow', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w700, color: UnionFlowColors.textPrimary)),
-              Text('Consultant', style: TextStyle(fontSize: 11, fontWeight: FontWeight.w400, color: UnionFlowColors.textSecondary)),
+              Text('UnionFlow', style: TextStyle(fontSize: 16, fontWeight: FontWeight.w700, color: Theme.of(context).colorScheme.onSurface)),
+              Text('Consultant', style: TextStyle(fontSize: 11, fontWeight: FontWeight.w400, color: Theme.of(context).colorScheme.onSurfaceVariant)),
             ],
           ),
         ],
       ),
-      iconTheme: const IconThemeData(color: UnionFlowColors.textPrimary),
+      iconTheme: IconThemeData(color: Theme.of(context).colorScheme.onSurface),
       actions: [
         UnionExportButton(
           onExport: (_) => Navigator.of(context).push(