优化windows笔记功能

lib/utils/theme/app_theme.dart

@@ -94,6 +94,17 @@ class AppTheme {
         minLeadingWidth: 0, dense: true,
       ),
       dividerTheme: DividerThemeData(color: scheme.outlineVariant, thickness: 0.5, space: 0),
+      scrollbarTheme: ScrollbarThemeData(
+        thumbColor: WidgetStateProperty.resolveWith((states) {
+          if (states.contains(WidgetState.hovered)) return scheme.onSurface.withValues(alpha: 0.3);
+          return scheme.onSurface.withValues(alpha: 0.1);
+        }),
+        thickness: WidgetStateProperty.resolveWith((states) {
+          if (states.contains(WidgetState.hovered)) return 6.0;
+          return 4.0;
+        }),
+        radius: const Radius.circular(3),
+      ),
       inputDecorationTheme: InputDecorationTheme(
         filled: false,
         border: UnderlineInputBorder(borderSide: BorderSide(color: scheme.outlineVariant, width: 0.5)),
@@ -231,6 +242,17 @@ class AppTheme {
         thickness: 0.5,
         space: 0,
       ),
+      scrollbarTheme: ScrollbarThemeData(
+        thumbColor: WidgetStateProperty.resolveWith((states) {
+          if (states.contains(WidgetState.hovered)) return _gray.withValues(alpha: 0.3);
+          return _gray.withValues(alpha: 0.1);
+        }),
+        thickness: WidgetStateProperty.resolveWith((states) {
+          if (states.contains(WidgetState.hovered)) return 6.0;
+          return 4.0;
+        }),
+        radius: const Radius.circular(3),
+      ),
       
       // 输入框 - 无边框，底部线
       inputDecorationTheme: InputDecorationTheme(
@@ -438,6 +460,17 @@ class AppTheme {
         thickness: 0.5,
         space: 0,
       ),
+      scrollbarTheme: ScrollbarThemeData(
+        thumbColor: WidgetStateProperty.resolveWith((states) {
+          if (states.contains(WidgetState.hovered)) return _lightGray.withValues(alpha: 0.4);
+          return _lightGray.withValues(alpha: 0.15);
+        }),
+        thickness: WidgetStateProperty.resolveWith((states) {
+          if (states.contains(WidgetState.hovered)) return 6.0;
+          return 4.0;
+        }),
+        radius: const Radius.circular(3),
+      ),
       
       inputDecorationTheme: InputDecorationTheme(
         filled: false,

lib/utils/toast_util.dart

@@ -1,4 +1,6 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
+import '../widgets/custom_title_bar.dart';
 
 /// Toast 工具类
 class ToastUtil {
@@ -13,7 +15,7 @@ class ToastUtil {
     final overlay = Overlay.of(context);
     _currentToast = OverlayEntry(
       builder: (context) => Positioned(
-        top: MediaQuery.of(context).padding.top + 80,
+        top: (Platform.isWindows ? CustomTitleBar.height : MediaQuery.of(context).padding.top) + 80,
         left: 0,
         right: 0,
         child: Center(