fix: 修复划转页面卡片互换动画效果

- 重写 AnimatedSwitcher 实现，移除多余的 Container 包裹
- 直接在 _buildAccountCard 上设置 ValueKey
- 使用 SlideTransition + FadeTransition 组合
- 上方卡片从上滑入，下方卡片从下滑入
- 动画时长 300ms，easeInOut 曲线
- 动画效果更流畅自然，卡片互换位置清晰可见

flutter_monisuo/build/web/main.dart.js_11.part.js

@@ -1,15 +1,15 @@
 ((a,b)=>{a[b]=a[b]||{}})(self,"$__dart_deferred_initializers__")
 $__dart_deferred_initializers__.current=function(a,b,c,$){var B,A={
-b3H(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.YA(v,u)
+b3L(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.YD(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.boI(u)
+v.r=A.boM(u)
 return u},
-bno(d,e){var y
+bns(d,e){var y
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 break A}if("timePicker.seconds"===e){y="\u0421\u0435\u043a\u0443\u043d\u0434\u044b"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="\u0412\u044b\u043b\u0443\u0447\u044b\u0446\
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 break A}return y},
-boI(d){return new A.aTA(d)},
-YA:function YA(d,e){var _=this
+boM(d){return new A.aTE(d)},
+YD:function YD(d,e){var _=this
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 _.z=_.w=$
 _.a=e
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-aNX:function aNX(){},
-aTA:function aTA(d){this.a=d},
-a9B:function a9B(){}}
+aNZ:function aNZ(){},
+aTE:function aTE(d){this.a=d},
+a9D:function a9D(){}}
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+A.YD.prototype={
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-x=y.z=new A.aNX()}return x},
+x=y.z=new A.aNZ()}return x},
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-A.aNX.prototype={
+A.aNZ.prototype={
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-A.a9B.prototype={}
+A.a9D.prototype={}
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-A.aTA.prototype={
-$1(d){return A.bno(this.a,d)},
+A.aTE.prototype={
+$1(d){return A.bns(this.a,d)},
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-x(A.a9B,B.a_)
-x(A.YA,A.a9B)
-x(A.aNX,B.aZ)
-x(A.aTA,B.aR)
-y(A.a9B,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"YA":{"a_":[]}}'))};
-(a=>{a["bin38p5ZaSbUvdb2in9spsQidHc="]=a.current})($__dart_deferred_initializers__);
+x(A.a9D,B.a_)
+x(A.YD,A.a9D)
+x(A.aNZ,B.aZ)
+x(A.aTE,B.aR)
+y(A.a9D,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"YD":{"a_":[]}}'))};
+(a=>{a["8ouqRW70kx89Bg8jkg+9rTp4Qd4="]=a.current})($__dart_deferred_initializers__);