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_85.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={
-b4s(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.Zl(v,u)
+b4w(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.Zo(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bnS(u)
+v.r=A.bnW(u)
 return u},
-bmy(d,e){var y
+bmC(d,e){var y
 A:{if("timePicker.hours"===e){y="Uren"
 break A}if("timePicker.minutes"===e){y="Minuten"
 break A}if("timePicker.seconds"===e){y="Seconden"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="Alles selecteren"
 break A}if("keyboardToolbar.done"===e){y="Gereed"
 break A}y=null
 break A}return y},
-bnS(d){return new A.aSK(d)},
-Zl:function Zl(d,e){var _=this
+bnW(d){return new A.aSO(d)},
+Zo:function Zo(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aOI:function aOI(){},
-aSK:function aSK(d){this.a=d},
-aam:function aam(){}}
+aOK:function aOK(){},
+aSO:function aSO(d){this.a=d},
+aao:function aao(){}}
 B=c[0]
 A=a.updateHolder(c[56],A)
-A.Zl.prototype={
+A.Zo.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aOI()}return x},
+x=y.z=new A.aOK()}return x},
 gb9(){return this.r}}
-A.aOI.prototype={
+A.aOK.prototype={
 gbh(){return"Knippen"},
 gbg(){return"Kopi\xebren"},
 gbi(){return"Plakken"},
 gbe(){return"Alles selecteren"}}
-A.aam.prototype={}
+A.aao.prototype={}
 var z=a.updateTypes([])
-A.aSK.prototype={
-$1(d){return A.bmy(this.a,d)},
+A.aSO.prototype={
+$1(d){return A.bmC(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aam,B.a_)
-x(A.Zl,A.aam)
-x(A.aOI,B.aZ)
-x(A.aSK,B.aR)
-y(A.aam,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"Zl":{"a_":[]}}'))};
-(a=>{a["2FjytEUhxTKlEMPGwdRxxpByzjE="]=a.current})($__dart_deferred_initializers__);
+x(A.aao,B.a_)
+x(A.Zo,A.aao)
+x(A.aOK,B.aZ)
+x(A.aSO,B.aR)
+y(A.aao,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"Zo":{"a_":[]}}'))};
+(a=>{a["Iq0aXGCYBjpSLAuBjUIitjvn3k0="]=a.current})($__dart_deferred_initializers__);