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/demande_aide_detail_page.dart

@@ -28,18 +28,19 @@ class _DemandeAideDetailPageState extends State<DemandeAideDetailPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      backgroundColor: AppColors.background,
-      appBar: const UFAppBar(
-        title: 'DÉTAIL DEMANDE',
-        backgroundColor: AppColors.surface,
-        foregroundColor: AppColors.textPrimaryLight,
+      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
+      appBar: UFAppBar(
+        title: 'Détail Demande',
+        moduleGradient: ModuleColors.solidariteGradient,
       ),
-      body: BlocConsumer<SolidarityBloc, SolidarityState>(
+      body: SafeArea(
+        top: false,
+        child: BlocConsumer<SolidarityBloc, SolidarityState>(
         listenWhen: (prev, curr) => prev.status != curr.status,
         listener: (context, state) {
           if (state.status == SolidarityStatus.error && state.message != null) {
             ScaffoldMessenger.of(context).showSnackBar(
-              SnackBar(content: Text(state.message!), backgroundColor: Colors.red),
+              SnackBar(content: Text(state.message!), backgroundColor: AppColors.error),
             );
           }
         },
@@ -55,7 +56,7 @@ class _DemandeAideDetailPageState extends State<DemandeAideDetailPage> {
               child: Column(
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: [
-                  const Icon(Icons.error_outline, size: 64, color: Colors.grey),
+                  const Icon(Icons.error_outline, size: 64, color: AppColors.textTertiary),
                   const SizedBox(height: 16),
                   Text(
                     'Demande introuvable',
@@ -65,7 +66,12 @@ class _DemandeAideDetailPageState extends State<DemandeAideDetailPage> {
               ),
             );
           }
-          return SingleChildScrollView(
+          return RefreshIndicator(
+            color: ModuleColors.solidarite,
+            onRefresh: () async =>
+                context.read<SolidarityBloc>().add(LoadDemandeAideById(widget.demandeId)),
+            child: SingleChildScrollView(
+            physics: const AlwaysScrollableScrollPhysics(),
             padding: const EdgeInsets.all(12),
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.start,
@@ -97,10 +103,12 @@ class _DemandeAideDetailPageState extends State<DemandeAideDetailPage> {
                 _ActionsSection(demande: d, isGestionnaire: _isGestionnaire()),
               ],
             ),
-          );
+          ),  // SingleChildScrollView
+          );  // RefreshIndicator
         },
-      ),
-    );
+      ),      // BlocConsumer
+      ),      // SafeArea
+    );        // Scaffold
   }
 
   bool _isGestionnaire() {
@@ -136,7 +144,7 @@ class _InfoCard extends StatelessWidget {
                   style: AppTypography.subtitleSmall.copyWith(
                     fontWeight: FontWeight.bold,
                     fontSize: 9,
-                    color: AppColors.textSecondaryLight,
+                    color: AppColors.textSecondary,
                   ),
                 ),
                 const SizedBox(height: 2),