feat: 为划转页面账户卡片添加位置互换动画

- 移除按钮旋转动画，保持按钮静止
- 两个账户卡片（从/到）平滑互换位置
- 使用 AnimatedSwitcher + FadeTransition + SlideTransition
- 动画时长 300ms，easeOut 曲线
- 上方卡片向上滑出，下方卡片向下滑入
- 视觉效果更流畅自然

flutter_monisuo/build/web/main.dart.js_20.part.js

@@ -1,15 +1,15 @@
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-bn7(d,e){var y
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+A.a9F.prototype={}
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-A.aTo.prototype={
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-(a=>{a["/V1uNjYaLJI2cjjsda7sdCJEi/M="]=a.current})($__dart_deferred_initializers__);
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+B.b4(b.typeUniverse,JSON.parse('{"YE":{"a_":[]}}'))};
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