feat:增加主题颜色和暗黑模式

lib/widgets/common.dart

@@ -8,21 +8,25 @@ BoxDecoration buildBoxDecoration() {
   );
 }
 
-Container buildBody({Widget? child}) {
-  return Container(
-    width: double.infinity,
-    color: Colors.grey[50],
-    padding: EdgeInsets.all(8),
-    child: child,
-  );
-}
+class BuildCard extends StatelessWidget {
+  final Widget? child;
 
-Container buildCard({Widget? child}) {
-  return Container(
-    decoration: buildBoxDecoration(),
-    padding: EdgeInsets.all(10),
-    child: child,
-  );
+  const BuildCard({super.key, this.child});
+
+  @override
+  Widget build(BuildContext context) {
+    final colors = Theme.of(context).colorScheme;
+
+    return Container(
+      decoration: BoxDecoration(
+        color: colors.surface,
+        borderRadius: BorderRadius.circular(12),
+        border: Border.all(color: colors.outline.withAlpha(50), width: 1),
+      ),
+      padding: const EdgeInsets.all(16),
+      child: child,
+    );
+  }
 }
 
 void buildModalBottom({