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_74.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={
-b4i(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.Zb(v,u)
+b4m(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.Ze(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bo2(u)
+v.r=A.bo6(u)
 return u},
-bmJ(d,e){var y
+bmN(d,e){var y
 A:{if("timePicker.hours"===e){y="Valandos"
 break A}if("timePicker.minutes"===e){y="Minut\u0117s"
 break A}if("timePicker.seconds"===e){y="Sekund\u0117s"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="Pasirinkti visk\u0105"
 break A}if("keyboardToolbar.done"===e){y="Atlikta"
 break A}y=null
 break A}return y},
-bo2(d){return new A.aSV(d)},
-Zb:function Zb(d,e){var _=this
+bo6(d){return new A.aSZ(d)},
+Ze:function Ze(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aOy:function aOy(){},
-aSV:function aSV(d){this.a=d},
-aac:function aac(){}}
+aOA:function aOA(){},
+aSZ:function aSZ(d){this.a=d},
+aae:function aae(){}}
 B=c[0]
 A=a.updateHolder(c[46],A)
-A.Zb.prototype={
+A.Ze.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aOy()}return x},
+x=y.z=new A.aOA()}return x},
 gb9(){return this.r}}
-A.aOy.prototype={
+A.aOA.prototype={
 gbh(){return"I\u0161kirpti"},
 gbg(){return"Kopijuoti"},
 gbi(){return"\u012eklijuoti"},
 gbe(){return"Pasirinkti visk\u0105"}}
-A.aac.prototype={}
+A.aae.prototype={}
 var z=a.updateTypes([])
-A.aSV.prototype={
-$1(d){return A.bmJ(this.a,d)},
+A.aSZ.prototype={
+$1(d){return A.bmN(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aac,B.a_)
-x(A.Zb,A.aac)
-x(A.aOy,B.aZ)
-x(A.aSV,B.aR)
-y(A.aac,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"Zb":{"a_":[]}}'))};
-(a=>{a["goHZgrdn4Y5/tSzwsnL4InETzaQ="]=a.current})($__dart_deferred_initializers__);
+x(A.aae,B.a_)
+x(A.Ze,A.aae)
+x(A.aOA,B.aZ)
+x(A.aSZ,B.aR)
+y(A.aae,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"Ze":{"a_":[]}}'))};
+(a=>{a["uqr76KlIUw8EyM//0JTCVpXg5Dc="]=a.current})($__dart_deferred_initializers__);