屏幕适配

lib/shared/widgets/app_avatar.dart

@@ -1,20 +1,22 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
 import 'package:recording_tool/shared/widgets/app_network_image.dart';
 
 class AppAvatar extends StatelessWidget {
-  const AppAvatar({super.key, this.imageUrl, this.initials, this.size = 40});
+  const AppAvatar({super.key, this.imageUrl, this.initials, this.size});
 
   final String? imageUrl;
   final String? initials;
-  final double size;
+  final double? size;
 
   @override
   Widget build(BuildContext context) {
-    final radius = BorderRadius.circular(size / 2);
+    final effectiveSize = size ?? 40.r;
+    final radius = BorderRadius.circular(effectiveSize / 2);
     return ClipRRect(
       borderRadius: radius,
       child: SizedBox.square(
-        dimension: size,
+        dimension: effectiveSize,
         child: imageUrl == null || imageUrl!.isEmpty
             ? ColoredBox(
                 color: Theme.of(context).colorScheme.primaryContainer,