style(theme): 客户端切换深色视觉风格

lib/core/widgets/centered_toast.dart

@@ -4,6 +4,8 @@ import 'dart:async';
 
 import 'package:flutter/material.dart';
 
+import '../theme/app_colors.dart';
+
 const Key _toastKey = Key('centered-toast');
 const Duration _fadeDuration = Duration(milliseconds: 200);
 const Duration _visibleDuration = Duration(seconds: 2);
@@ -11,9 +13,8 @@ const double _toastRadius = 12;
 const double _toastMaxWidth = 320;
 const double _toastHorizontalInset = 20;
 const double _toastVerticalInset = 12;
-const double _toastBackgroundOpacity = 0.78;
 const TextStyle _toastTextStyle = TextStyle(
-  color: Colors.white,
+  color: AppColors.onSurface,
   fontSize: 14,
   height: 1.4,
   fontWeight: FontWeight.w500,
@@ -108,10 +109,9 @@ class _CenteredToastState extends State<_CenteredToast>
                 constraints: const BoxConstraints(maxWidth: _toastMaxWidth),
                 padding: _toastPadding,
                 decoration: BoxDecoration(
-                  color: Colors.black.withValues(
-                    alpha: _toastBackgroundOpacity,
-                  ),
+                  color: AppColors.raised,
                   borderRadius: BorderRadius.circular(_toastRadius),
+                  border: Border.all(color: AppColors.border),
                 ),
                 child: Text(
                   widget.message,