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_25.part.js

@@ -1,15 +1,15 @@
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-u=new A.YC(v,u)
+b3N(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
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+v.r=A.boB(u)
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-bn4(d,e){var y
+bnh(d,e){var y
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-A.a9D.prototype={}
+A.a9H.prototype={}
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-A.aTl.prototype={
-$1(d){return A.bn4(this.a,d)},
+A.aTt.prototype={
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-x(A.aNX,B.aZ)
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-B.b3(b.typeUniverse,JSON.parse('{"YC":{"a_":[]}}'))};
-(a=>{a["xGZQIVA0f1lTltpyeYZHfKEr0N0="]=a.current})($__dart_deferred_initializers__);
+x(A.a9H,B.a_)
+x(A.YG,A.a9H)
+x(A.aO2,B.aZ)
+x(A.aTt,B.aR)
+y(A.a9H,B.aX)})()
+B.b4(b.typeUniverse,JSON.parse('{"YG":{"a_":[]}}'))};
+(a=>{a["MrUrBGER+hZvYcoJEyP0lhZlahA="]=a.current})($__dart_deferred_initializers__);