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/solidarity/presentation/pages/demandes_aide_page.dart

@@ -76,17 +76,16 @@ class _DemandesAidePageState extends State<DemandesAidePage>
         }
       },
       child: Scaffold(
-        backgroundColor: AppColors.background,
+        backgroundColor: Theme.of(context).scaffoldBackgroundColor,
         appBar: UFAppBar(
-          title: 'SOLIDARITÉ',
-          backgroundColor: AppColors.surface,
-          foregroundColor: AppColors.textPrimaryLight,
+          title: 'Solidarité',
+          moduleGradient: ModuleColors.solidariteGradient,
           bottom: TabBar(
             controller: _tabController,
             onTap: _loadTab,
-            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 [
@@ -125,7 +124,13 @@ class _DemandesAidePageState extends State<DemandesAidePage>
             child: Column(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
-                const Icon(Icons.volunteer_activism_outlined, size: 32, color: AppColors.lightBorder),
+                Icon(
+                  Icons.volunteer_activism_outlined,
+                  size: 32,
+                  color: Theme.of(context).brightness == Brightness.dark
+                      ? AppColors.borderDark
+                      : AppColors.border,
+                ),
                 const SizedBox(height: 12),
                 Text('Aucune demande', style: AppTypography.subtitleSmall),
               ],
@@ -204,7 +209,7 @@ class _DemandeCard extends StatelessWidget {
                   ],
                 ),
               ),
-              _buildStatutBadge(demande.statut),
+              _buildStatutBadge(context, demande.statut),
             ],
           ),
           const SizedBox(height: 12),
@@ -217,7 +222,7 @@ class _DemandeCard extends StatelessWidget {
                   Text('MONTANT DEMANDÉ', style: AppTypography.subtitleSmall.copyWith(fontSize: 8, fontWeight: FontWeight.bold)),
                   Text(
                     currencyFormat.format(demande.montantDemande ?? 0),
-                    style: AppTypography.headerSmall.copyWith(fontSize: 13, color: AppColors.primaryGreen),
+                    style: AppTypography.headerSmall.copyWith(fontSize: 13, color: AppColors.primary),
                   ),
                 ],
               ),
@@ -235,7 +240,7 @@ class _DemandeCard extends StatelessWidget {
     );
   }
 
-  Widget _buildStatutBadge(String? statut) {
+  Widget _buildStatutBadge(BuildContext context, String? statut) {
     Color color;
     switch (statut) {
       case 'APPROUVEE':
@@ -246,10 +251,12 @@ class _DemandeCard extends StatelessWidget {
         break;
       case 'EN_ATTENTE':
       case 'SOUMISE':
-        color = AppColors.brandGreenLight;
+        color = AppColors.primaryLight;
         break;
       default:
-        color = AppColors.textSecondaryLight;
+        color = Theme.of(context).brightness == Brightness.dark
+            ? AppColors.textSecondaryDark
+            : AppColors.textSecondary;
     }
     return InfoBadge(text: statut ?? 'INCONNU', backgroundColor: color);
   }