fix(ui): 修复分割线透明度问题

- 使用 ghostBorder 替代 outlineVariant.withAlpha(0.1)
- 提高分割线可见度

flutter_monisuo/build/web/flutter_bootstrap.js

@@ -37,6 +37,6 @@ _flutter.buildConfig = {"engineRevision":"e4b8dca3f1b4ede4c30371002441c88c12187e
 
 _flutter.loader.load({
   serviceWorkerSettings: {
-    serviceWorkerVersion: "3968745925" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
+    serviceWorkerVersion: "576740159" /* Flutter's service worker is deprecated and will be removed in a future Flutter release. */
   }
 });

flutter_monisuo/lib/ui/pages/home/home_page.dart

@@ -1038,7 +1038,7 @@ class _HoldingsList extends StatelessWidget {
         padding: EdgeInsets.all(AppSpacing.md),
         itemCount: displayHoldings.length,
         separatorBuilder: (_, __) => Divider(
-          color: context.colors.outlineVariant.withValues(alpha: 0.1),
+          color: context.appColors.ghostBorder,
           height: 1,
         ),
         itemBuilder: (context, index) =>