factor:布局颜色重构

lib/widget/search.dart

@@ -27,14 +27,13 @@ Widget buildSearchField({
 }
 
 Widget buildSearchResultItem(BuildContext context, BlogSearch blog) {
+  final colors = Theme.of(context).colorScheme;
+
   return BuildCard(
     child: ListTile(
       title: Text(
         blog.title,
-        style: TextStyle(
-          fontWeight: FontWeight.bold,
-          color: Theme.of(context).colorScheme.primary,
-        ),
+        style: TextStyle(fontWeight: FontWeight.bold, color: colors.primary),
       ),
       subtitle: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -42,7 +41,7 @@ Widget buildSearchResultItem(BuildContext context, BlogSearch blog) {
           SizedBox(height: 4),
           Text(
             blog.content,
-            style: TextStyle(color: Colors.grey[600], fontSize: 14),
+            style: TextStyle(color: colors.secondary, fontSize: 14),
           ),
         ],
       ),