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

apps/lib/shared/widgets/destructive_action_sheet.dart

@@ -13,8 +13,10 @@ Future<bool> showDestructiveActionSheet(
   final result = await showModalBottomSheet<bool>(
     context: context,
     isScrollControlled: true,
-    backgroundColor: Colors.transparent,
+    backgroundColor: Theme.of(context).colorScheme.surface.withValues(alpha: 0),
     builder: (sheetContext) {
+      final colorScheme = Theme.of(sheetContext).colorScheme;
+
       return SafeArea(
         top: false,
         child: Container(
@@ -26,9 +28,9 @@ Future<bool> showDestructiveActionSheet(
           ),
           padding: const EdgeInsets.all(AppSpacing.lg),
           decoration: BoxDecoration(
-            color: AppColors.white,
+            color: colorScheme.surface,
             borderRadius: BorderRadius.circular(AppRadius.xl),
-            border: Border.all(color: AppColors.borderSecondary),
+            border: Border.all(color: colorScheme.outlineVariant),
           ),
           child: Column(
             mainAxisSize: MainAxisSize.min,
@@ -37,17 +39,20 @@ Future<bool> showDestructiveActionSheet(
               Text(
                 title,
                 textAlign: TextAlign.center,
-                style: const TextStyle(
+                style: TextStyle(
                   fontSize: 18,
                   fontWeight: FontWeight.w700,
-                  color: AppColors.slate900,
+                  color: colorScheme.onSurface,
                 ),
               ),
               const SizedBox(height: AppSpacing.xs),
               Text(
                 message,
                 textAlign: TextAlign.center,
-                style: const TextStyle(fontSize: 14, color: AppColors.slate500),
+                style: TextStyle(
+                  fontSize: 14,
+                  color: colorScheme.onSurfaceVariant,
+                ),
               ),
               const SizedBox(height: AppSpacing.lg),
               SizedBox(
@@ -57,15 +62,15 @@ Future<bool> showDestructiveActionSheet(
                   child: Container(
                     alignment: Alignment.center,
                     decoration: BoxDecoration(
-                      color: AppColors.feedbackErrorIcon,
+                      color: colorScheme.error,
                       borderRadius: BorderRadius.circular(AppRadius.full),
                     ),
                     child: Text(
                       confirmText,
-                      style: const TextStyle(
+                      style: TextStyle(
                         fontSize: 15,
                         fontWeight: FontWeight.w700,
-                        color: AppColors.white,
+                        color: colorScheme.onError,
                       ),
                     ),
                   ),