feat(ui): RefreshIndicator + AlwaysScrollable + dark mode sur 14 pages

RefreshIndicator ajouté (dispatche les events BLoC appropriés) :
- adhesion_detail, adhesions_page, demande_aide_detail, demandes_aide_page
- event_detail, organization_detail, org_selector, org_types
- user_management_detail, reports (TabBarView), logs (Dashboard tab)
- profile (onglet Perso), backup (3 onglets), notifications

Fixes associés :
- AlwaysScrollableScrollPhysics sur tous les scroll widgets
  (permet pull-to-refresh même si contenu < écran)
- Empty states des listes : wrappés dans SingleChildScrollView pour refresh
- Dark mode adaptatif sur textes/surfaces/borders hardcodés
- backup_page : bouton retour ajouté dans le header gradient
- org_types : chevron/star/border adaptatifs
- reports : couleurs placeholders graphique + chevrons

lib/features/adhesions/presentation/pages/adhesion_detail_page.dart

@@ -31,13 +31,14 @@ class _AdhesionDetailPageState extends State<AdhesionDetailPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      backgroundColor: AppColors.background,
-      appBar: const UFAppBar(
-        title: 'DÉTAIL ADHÉSION',
-        backgroundColor: AppColors.surface,
-        foregroundColor: AppColors.textPrimaryLight,
+      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
+      appBar: UFAppBar(
+        title: 'Détail Adhésion',
+        moduleGradient: ModuleColors.adhesionsGradient,
       ),
-      body: BlocConsumer<AdhesionsBloc, AdhesionsState>(
+      body: SafeArea(
+        top: false,
+        child: BlocConsumer<AdhesionsBloc, AdhesionsState>(
         listenWhen: (prev, curr) => prev.status != curr.status,
         listener: (context, state) {
           if (state.status == AdhesionsStatus.error && state.message != null) {
@@ -58,7 +59,7 @@ class _AdhesionDetailPageState extends State<AdhesionDetailPage> {
               child: Column(
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: [
-                  const Icon(Icons.error_outline, size: 64, color: AppColors.textSecondaryLight),
+                  Icon(Icons.error_outline, size: 64, color: Theme.of(context).colorScheme.onSurfaceVariant),
                   const SizedBox(height: 16),
                   Text(
                     'Adhésion introuvable',
@@ -68,7 +69,12 @@ class _AdhesionDetailPageState extends State<AdhesionDetailPage> {
               ),
             );
           }
-          return SingleChildScrollView(
+          return RefreshIndicator(
+            color: ModuleColors.adhesions,
+            onRefresh: () async =>
+                context.read<AdhesionsBloc>().add(LoadAdhesionById(widget.adhesionId)),
+            child: SingleChildScrollView(
+            physics: const AlwaysScrollableScrollPhysics(),
             padding: const EdgeInsets.all(12),
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -118,10 +124,12 @@ class _AdhesionDetailPageState extends State<AdhesionDetailPage> {
                 _ActionsSection(adhesion: a, currencyFormat: _currencyFormat, isGestionnaire: _isGestionnaire()),
               ],
             ),
-          );
+          ),  // SingleChildScrollView
+          );  // RefreshIndicator
         },
-      ),
-    );
+      ),      // BlocConsumer
+      ),      // SafeArea
+    );        // Scaffold
   }
 
   bool _isGestionnaire() {
@@ -157,7 +165,7 @@ class _InfoCard extends StatelessWidget {
                   style: AppTypography.subtitleSmall.copyWith(
                     fontWeight: FontWeight.bold,
                     fontSize: 9,
-                    color: AppColors.textSecondaryLight,
+                    color: AppColors.textSecondary,
                   ),
                 ),
                 const SizedBox(height: 2),
@@ -187,13 +195,13 @@ Widget _buildStatutBadge(String? statut) {
       color = AppColors.error;
       break;
     case 'EN_ATTENTE':
-      color = AppColors.brandGreenLight;
+      color = AppColors.primaryLight;
       break;
     case 'EN_PAIEMENT':
       color = AppColors.warning;
       break;
     default:
-      color = AppColors.textSecondaryLight;
+      color = AppColors.textSecondary;
   }
   return InfoBadge(text: statut ?? 'INCONNU', backgroundColor: color);
 }
@@ -307,7 +315,7 @@ class _ActionsSection extends StatelessWidget {
               );
             },
             style: ElevatedButton.styleFrom(
-              backgroundColor: AppColors.primaryGreen,
+              backgroundColor: AppColors.primary,
               foregroundColor: Colors.white,
               elevation: 0,
               padding: const EdgeInsets.symmetric(vertical: 12),