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/adhesions_page.dart

@@ -89,11 +89,10 @@ class _AdhesionsPageState extends State<AdhesionsPage>
         }
       },
       child: Scaffold(
-        backgroundColor: AppColors.background,
+        backgroundColor: Theme.of(context).scaffoldBackgroundColor,
         appBar: UFAppBar(
-          title: 'ADHÉSIONS',
-          backgroundColor: AppColors.surface,
-          foregroundColor: AppColors.textPrimaryLight,
+          title: 'Adhésions',
+          moduleGradient: ModuleColors.adhesionsGradient,
           actions: [
             IconButton(
               icon: const Icon(Icons.add, size: 20),
@@ -105,9 +104,9 @@ class _AdhesionsPageState extends State<AdhesionsPage>
             controller: _tabController,
             onTap: _loadTab,
             isScrollable: true,
-            labelColor: AppColors.primaryGreen,
-            unselectedLabelColor: AppColors.textSecondaryLight,
-            indicatorColor: AppColors.primaryGreen,
+            labelColor: Colors.white,
+            unselectedLabelColor: Colors.white70,
+            indicatorColor: Colors.white,
             indicatorSize: TabBarIndicatorSize.label,
             labelStyle: AppTypography.actionText.copyWith(fontSize: 10, fontWeight: FontWeight.bold),
             tabs: const [
@@ -148,11 +147,17 @@ class _AdhesionsPageState extends State<AdhesionsPage>
             child: Column(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
-                Icon(Icons.assignment_outlined, size: 40, color: AppColors.textSecondaryLight),
+                Icon(
+                  Icons.assignment_outlined,
+                  size: 40,
+                  color: Theme.of(context).brightness == Brightness.dark
+                      ? AppColors.textSecondaryDark
+                      : AppColors.textSecondary,
+                ),
                 const SizedBox(height: 8),
                 Text(
                   'Aucune demande d\'adhésion',
-                  style: AppTypography.bodyTextSmall.copyWith(fontSize: 16, color: AppColors.textSecondaryLight),
+                  style: AppTypography.bodyTextSmall.copyWith(fontSize: 16, color: Theme.of(context).colorScheme.onSurfaceVariant),
                 ),
                 const SizedBox(height: 8),
                 TextButton.icon(
@@ -249,7 +254,7 @@ class _AdhesionCard extends StatelessWidget {
                   ],
                 ),
               ),
-              _buildStatutBadge(adhesion.statut),
+              _buildStatutBadge(context, adhesion.statut),
             ],
           ),
           const SizedBox(height: 12),
@@ -262,7 +267,7 @@ class _AdhesionCard extends StatelessWidget {
                   Text('FRAIS D\'ADHÉSION', style: AppTypography.subtitleSmall.copyWith(fontSize: 8, fontWeight: FontWeight.bold)),
                   Text(
                     adhesion.fraisAdhesion != null ? currencyFormat.format(adhesion.fraisAdhesion) : '—',
-                    style: AppTypography.headerSmall.copyWith(fontSize: 13, color: AppColors.primaryGreen),
+                    style: AppTypography.headerSmall.copyWith(fontSize: 13, color: AppColors.primary),
                   ),
                 ],
               ),
@@ -283,7 +288,7 @@ class _AdhesionCard extends StatelessWidget {
             const SizedBox(height: 8),
             Text(
               'MEMBRE : ${adhesion.nomMembreComplet.toUpperCase()}',
-              style: AppTypography.subtitleSmall.copyWith(fontSize: 8, color: AppColors.textSecondaryLight),
+              style: AppTypography.subtitleSmall.copyWith(fontSize: 8, color: Theme.of(context).colorScheme.onSurfaceVariant),
             ),
           ],
         ],
@@ -291,7 +296,7 @@ class _AdhesionCard extends StatelessWidget {
     );
   }
 
-  Widget _buildStatutBadge(String? statut) {
+  Widget _buildStatutBadge(BuildContext context, String? statut) {
     Color color;
     switch (statut) {
       case 'APPROUVEE':
@@ -303,13 +308,15 @@ class _AdhesionCard extends StatelessWidget {
         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 = Theme.of(context).brightness == Brightness.dark
+            ? AppColors.textSecondaryDark
+            : AppColors.textSecondary;
     }
     return InfoBadge(text: statut ?? 'INCONNU', backgroundColor: color);
   }