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

apps/lib/shared/widgets/app_selection_sheet.dart

@@ -20,8 +20,9 @@ Future<T?> showAppSelectionSheet<T>(
   final result = await showModalBottomSheet<T>(
     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(
@@ -33,9 +34,9 @@ Future<T?> showAppSelectionSheet<T>(
           ),
           padding: const EdgeInsets.symmetric(vertical: 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,
@@ -46,10 +47,10 @@ Future<T?> showAppSelectionSheet<T>(
                 child: Text(
                   title,
                   textAlign: TextAlign.center,
-                  style: const TextStyle(
+                  style: TextStyle(
                     fontSize: 17,
                     fontWeight: FontWeight.w700,
-                    color: AppColors.slate900,
+                    color: colorScheme.onSurface,
                   ),
                 ),
               ),
@@ -62,9 +63,9 @@ Future<T?> showAppSelectionSheet<T>(
                   isSelected: isSelected,
                 );
               }),
-              const SizedBox(height: AppSpacing.sm),
-              const Divider(height: 1, color: AppColors.border),
-              const SizedBox(height: AppSpacing.sm),
+              SizedBox(height: AppSpacing.sm),
+              Divider(height: 1, color: colorScheme.outlineVariant),
+              SizedBox(height: AppSpacing.sm),
               Padding(
                 padding: const EdgeInsets.symmetric(horizontal: AppSpacing.lg),
                 child: SizedBox(
@@ -90,6 +91,7 @@ Widget _buildItem<T>(
   required AppSelectionItem<T> item,
   required bool isSelected,
 }) {
+  final colorScheme = Theme.of(sheetContext).colorScheme;
   return InkWell(
     onTap: () => Navigator.of(sheetContext).pop(item.value),
     child: Container(
@@ -105,12 +107,14 @@ Widget _buildItem<T>(
               style: TextStyle(
                 fontSize: 15,
                 fontWeight: isSelected ? FontWeight.w600 : FontWeight.w500,
-                color: isSelected ? AppColors.blue600 : AppColors.slate800,
+                color: isSelected
+                    ? colorScheme.primary
+                    : colorScheme.onSurfaceVariant,
               ),
             ),
           ),
           if (isSelected)
-            const Icon(Icons.check, size: 20, color: AppColors.blue600),
+            Icon(Icons.check, size: 20, color: colorScheme.primary),
         ],
       ),
     ),