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/dashboard/presentation/widgets/charts/dashboard_chart_widget.dart

@@ -56,7 +56,7 @@ class DashboardChartWidget extends StatelessWidget {
       children: [
         Icon(
           _getChartIcon(),
-          color: AppColors.primaryGreen,
+          color: AppColors.primary,
           size: 18,
         ),
         const SizedBox(width: 8),
@@ -100,12 +100,12 @@ class DashboardChartWidget extends StatelessWidget {
             ),
           ),
           PieChartSectionData(
-            color: AppColors.lightBorder,
+            color: AppColors.border,
             value: (stats.totalMembers - stats.activeMembers).toDouble(),
             title: '${stats.totalMembers - stats.activeMembers}',
             radius: 45,
             titleStyle: AppTypography.badgeText.copyWith(
-              color: AppColors.textSecondaryLight,
+              color: AppColors.textSecondary,
               fontWeight: FontWeight.bold,
             ),
           ),
@@ -123,7 +123,7 @@ class DashboardChartWidget extends StatelessWidget {
           horizontalInterval: stats.totalContributionAmount / 4,
           getDrawingHorizontalLine: (value) {
             return const FlLine(
-              color: AppColors.lightBorder,
+              color: AppColors.border,
               strokeWidth: 1,
             );
           },
@@ -174,8 +174,8 @@ class DashboardChartWidget extends StatelessWidget {
             isCurved: true,
             gradient: const LinearGradient(
               colors: [
-                AppColors.brandGreen,
-                AppColors.primaryGreen,
+                AppColors.primaryDark,
+                AppColors.primary,
               ],
             ),
             barWidth: 3,
@@ -185,8 +185,8 @@ class DashboardChartWidget extends StatelessWidget {
               show: true,
               gradient: LinearGradient(
                 colors: [
-                  AppColors.brandGreen.withOpacity(0.3),
-                  AppColors.primaryGreen.withOpacity(0.1),
+                  AppColors.primaryDark.withOpacity(0.3),
+                  AppColors.primary.withOpacity(0.1),
                 ],
                 begin: Alignment.topCenter,
                 end: Alignment.bottomCenter,
@@ -314,13 +314,13 @@ class DashboardChartWidget extends StatelessWidget {
   Widget _buildLoadingChart() {
     return Container(
       decoration: BoxDecoration(
-        color: AppColors.lightBorder.withOpacity(0.5),
+        color: AppColors.border.withOpacity(0.5),
         borderRadius: BorderRadius.circular(12),
       ),
       child: const Center(
         child: CircularProgressIndicator(
           strokeWidth: 2,
-          valueColor: AlwaysStoppedAnimation<Color>(AppColors.primaryGreen),
+          valueColor: AlwaysStoppedAnimation<Color>(AppColors.primary),
         ),
       ),
     );
@@ -359,7 +359,7 @@ class DashboardChartWidget extends StatelessWidget {
   Widget _buildEmptyChart() {
     return Container(
       decoration: BoxDecoration(
-        color: AppColors.lightBorder.withOpacity(0.2),
+        color: AppColors.border.withOpacity(0.2),
         borderRadius: BorderRadius.circular(12),
       ),
       child: Center(
@@ -368,7 +368,7 @@ class DashboardChartWidget extends StatelessWidget {
           children: [
             const Icon(
               Icons.bar_chart_outlined,
-              color: AppColors.textSecondaryLight,
+              color: AppColors.textSecondary,
               size: 24,
             ),
             const SizedBox(height: 8),