屏幕适配

lib/shared/widgets/app_button.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
 
 enum AppButtonVariant { primary, secondary, outline, text, danger }
 
@@ -11,7 +12,7 @@ class AppButton extends StatelessWidget {
     this.variant = AppButtonVariant.primary,
     this.isLoading = false,
     this.expand = false,
-    this.height = 44,
+    this.height,
   });
 
   final String label;
@@ -20,7 +21,7 @@ class AppButton extends StatelessWidget {
   final AppButtonVariant variant;
   final bool isLoading;
   final bool expand;
-  final double height;
+  final double? height;
 
   @override
   Widget build(BuildContext context) {
@@ -30,7 +31,7 @@ class AppButton extends StatelessWidget {
       isLoading: isLoading,
     );
     final enabled = isLoading ? null : onPressed;
-    final size = Size(expand ? double.infinity : 0, height);
+    final size = Size(expand ? double.infinity : 0, height ?? 44.h);
 
     return switch (variant) {
       AppButtonVariant.primary => ElevatedButton(
@@ -79,9 +80,9 @@ class _ButtonContent extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     if (isLoading) {
-      return const SizedBox.square(
-        dimension: 18,
-        child: CircularProgressIndicator(strokeWidth: 2),
+      return SizedBox.square(
+        dimension: 18.r,
+        child: CircularProgressIndicator(strokeWidth: 2.r),
       );
     }
 
@@ -92,7 +93,7 @@ class _ButtonContent extends StatelessWidget {
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
         icon!,
-        const SizedBox(width: 8),
+        SizedBox(width: 8.w),
         Flexible(child: Text(label, overflow: TextOverflow.ellipsis)),
       ],
     );