factor:布局颜色重构

lib/widget/markdown.dart

@@ -8,6 +8,7 @@ Widget buildMarkdown({
 }) => MarkdownWidget(data: data, tocController: tocController);
 
 Widget buildTocPanel({
+  required BuildContext context,
   required TocController tocController,
   required bool showToc,
 }) => Visibility(
@@ -18,7 +19,7 @@ Widget buildTocPanel({
       width: 250,
       height: 400,
       decoration: BoxDecoration(
-        color: Colors.white,
+        color: Theme.of(context).colorScheme.surfaceContainer,
         borderRadius: BorderRadius.circular(12),
         boxShadow: [
           BoxShadow(
@@ -34,7 +35,7 @@ Widget buildTocPanel({
           Container(
             padding: const EdgeInsets.all(12),
             decoration: BoxDecoration(
-              color: Colors.grey[100],
+              color: Theme.of(context).colorScheme.surface,
               borderRadius: const BorderRadius.only(
                 topLeft: Radius.circular(12),
                 topRight: Radius.circular(12),