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_13.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={
-b3I(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.YB(v,u)
+b3M(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.YE(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.boH(u)
+v.r=A.boL(u)
 return u},
-bnn(d,e){var y
+bnr(d,e){var y
 A:{if("timePicker.hours"===e){y="\u0427\u0430\u0441\u043e\u0432\u0435"
 break A}if("timePicker.minutes"===e){y="\u041c\u0438\u043d\u0443\u0442\u0438"
 break A}if("timePicker.seconds"===e){y="\u0421\u0435\u043a\u0443\u043d\u0434\u0438"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="\u0418\u0437\u0431\u0435\u0440\u0438 \u0432
 break A}if("keyboardToolbar.done"===e){y="\u0413\u043e\u0442\u043e\u0432\u043e"
 break A}y=null
 break A}return y},
-boH(d){return new A.aTz(d)},
-YB:function YB(d,e){var _=this
+boL(d){return new A.aTD(d)},
+YE:function YE(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aNY:function aNY(){},
-aTz:function aTz(d){this.a=d},
-a9C:function a9C(){}}
+aO_:function aO_(){},
+aTD:function aTD(d){this.a=d},
+a9E:function a9E(){}}
 B=c[0]
 A=a.updateHolder(c[9],A)
-A.YB.prototype={
+A.YE.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aNY()}return x},
+x=y.z=new A.aO_()}return x},
 gb9(){return this.r}}
-A.aNY.prototype={
+A.aO_.prototype={
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 gbg(){return"\u041a\u043e\u043f\u0438\u0440\u0430\u0439"},
 gbi(){return"\u041f\u043e\u0441\u0442\u0430\u0432\u0438"},
 gbe(){return"\u0418\u0437\u0431\u0435\u0440\u0438 \u0432\u0441\u0438\u0447\u043a\u043e"}}
-A.a9C.prototype={}
+A.a9E.prototype={}
 var z=a.updateTypes([])
-A.aTz.prototype={
-$1(d){return A.bnn(this.a,d)},
+A.aTD.prototype={
+$1(d){return A.bnr(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.a9C,B.a_)
-x(A.YB,A.a9C)
-x(A.aNY,B.aZ)
-x(A.aTz,B.aR)
-y(A.a9C,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"YB":{"a_":[]}}'))};
-(a=>{a["V7jA0TiL+99OlkgQVbCWQ6mGTgE="]=a.current})($__dart_deferred_initializers__);
+x(A.a9E,B.a_)
+x(A.YE,A.a9E)
+x(A.aO_,B.aZ)
+x(A.aTD,B.aR)
+y(A.a9E,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"YE":{"a_":[]}}'))};
+(a=>{a["5daoC3ZYv4InN6NmMJ4oJlB5Lx8="]=a.current})($__dart_deferred_initializers__);