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/admin/presentation/pages/user_management_page.dart

@@ -41,9 +41,10 @@ class _UserManagementViewState extends State<_UserManagementView> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      backgroundColor: AppColors.background,
+      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
       appBar: UFAppBar(
         title: 'Gestion des utilisateurs',
+        moduleGradient: ModuleColors.systemeGradient,
         actions: [
           IconButton(
             icon: const Icon(Icons.refresh, size: 20),
@@ -51,7 +52,9 @@ class _UserManagementViewState extends State<_UserManagementView> {
           ),
         ],
       ),
-      body: Column(
+      body: SafeArea(
+        top: false,
+        child: Column(
         children: [
           Padding(
             padding: const EdgeInsets.all(12),
@@ -63,18 +66,18 @@ class _UserManagementViewState extends State<_UserManagementView> {
                 prefixIcon: const Icon(Icons.search, size: 18),
                 border: OutlineInputBorder(
                   borderRadius: BorderRadius.circular(RadiusTokens.md),
-                  borderSide: const BorderSide(color: AppColors.lightBorder),
+                  borderSide: BorderSide(color: Theme.of(context).colorScheme.outline),
                 ),
                 enabledBorder: OutlineInputBorder(
                   borderRadius: BorderRadius.circular(RadiusTokens.md),
-                  borderSide: const BorderSide(color: AppColors.lightBorder),
+                  borderSide: BorderSide(color: Theme.of(context).colorScheme.outline),
                 ),
                 focusedBorder: OutlineInputBorder(
                   borderRadius: BorderRadius.circular(RadiusTokens.md),
-                  borderSide: const BorderSide(color: AppColors.primaryGreen),
+                  borderSide: BorderSide(color: Theme.of(context).colorScheme.primary),
                 ),
                 filled: true,
-                fillColor: AppColors.lightSurface,
+                fillColor: Theme.of(context).colorScheme.surfaceContainerHighest,
                 contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
               ),
               onSubmitted: (v) => context.read<AdminUsersBloc>().add(
@@ -131,6 +134,7 @@ class _UserManagementViewState extends State<_UserManagementView> {
           ),
         ],
       ),
+      ),
     );
   }
 
@@ -168,11 +172,11 @@ class _UserManagementViewState extends State<_UserManagementView> {
               ],
             ),
           ),
-          const Icon(
+          Icon(
             Icons.chevron_right,
             size: 16,
-            color: AppColors.textSecondaryLight,
-          ),
+            color: Theme.of(context).colorScheme.onSurfaceVariant,
+            ),
         ],
       ),
     );