优化调整“我的”界面

lib/widgets/top_fade_scrim.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+
+/// 列表顶部渐变遮罩带：从 surface 色渐变到透明，
+/// 让滚动内容从状态栏下方淡入淡出。
+class TopFadeScrim extends StatelessWidget {
+  const TopFadeScrim({super.key, this.height = 12});
+
+  final double height;
+
+  @override
+  Widget build(BuildContext context) {
+    final colors = Theme.of(context).colorScheme;
+    return IgnorePointer(
+      child: Align(
+        alignment: Alignment.topCenter,
+        child: Container(
+          height: height,
+          decoration: BoxDecoration(
+            gradient: LinearGradient(
+              begin: Alignment.topCenter,
+              end: Alignment.bottomCenter,
+              colors: [
+                colors.surface,
+                colors.surface.withValues(alpha: 0),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}