refactor(apps): 主题系统迁移至 ColorScheme + 扩展架构并支持 Dark Mode

apps/lib/shared/widgets/app_pull_refresh_feedback.dart

@@ -18,6 +18,7 @@ class AppPullRefreshFeedback extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
     final resolvedLabel = label ?? context.l10n.commonRefreshing;
     return IgnorePointer(
       child: AnimatedOpacity(
@@ -31,24 +32,24 @@ class AppPullRefreshFeedback extends StatelessWidget {
             vertical: AppSpacing.xs,
           ),
           decoration: BoxDecoration(
-            color: AppColors.white,
+            color: colorScheme.surface,
             borderRadius: BorderRadius.circular(AppRadius.full),
-            border: Border.all(color: AppColors.borderSecondary),
+            border: Border.all(color: colorScheme.outlineVariant),
           ),
           child: Row(
             mainAxisSize: MainAxisSize.min,
             crossAxisAlignment: CrossAxisAlignment.center,
             children: [
-              const AppLoadingIndicator(
+              AppLoadingIndicator(
                 variant: AppLoadingVariant.inline,
-                color: AppColors.blue500,
-                trackColor: AppColors.blue100,
+                color: colorScheme.primary,
+                trackColor: colorScheme.primaryContainer,
               ),
               const SizedBox(width: AppSpacing.sm),
               Text(
                 resolvedLabel,
                 style: Theme.of(context).textTheme.labelSmall?.copyWith(
-                  color: AppColors.slate600,
+                  color: colorScheme.onSurfaceVariant,
                   fontWeight: FontWeight.w500,
                 ),
               ),