feat:增加博客分类模块

lib/widget/common.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+
+Widget buildCard({required BuildContext context, required Widget child}) {
+  final colors = Theme.of(context).colorScheme;
+  return Card(
+    elevation: 0,
+    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+    child: Container(
+      width: double.infinity,
+      decoration: BoxDecoration(
+        color: colors.surface,
+        borderRadius: BorderRadius.circular(12),
+        border: Border.all(color: colors.outline.withAlpha(50), width: 1),
+      ),
+      child: Padding(padding: EdgeInsets.all(8), child: child),
+    ),
+  );
+}