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_46.part.js

@@ -1,15 +1,15 @@
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+b3Y(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
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+v.r=A.bop(u)
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+bn5(d,e){var y
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@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="Tout s\xe9lectionner"
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-(a=>{a["b+Gc38mOhe3Wjl/UOFrLsndXl5o="]=a.current})($__dart_deferred_initializers__);
+x(A.a9S,B.a_)
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+B.b4(b.typeUniverse,JSON.parse('{"YR":{"a_":[]}}'))};
+(a=>{a["9NTYdPnyJvZ0OhTD5ECQueYy4Nw="]=a.current})($__dart_deferred_initializers__);