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_82.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={
-b4q(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.Zj(v,u)
+b4u(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.Zm(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bnU(u)
+v.r=A.bnY(u)
 return u},
-bmA(d,e){var y
+bmE(d,e){var y
 A:{if("timePicker.hours"===e){y="Timer"
 break A}if("timePicker.minutes"===e){y="Minutter"
 break A}if("timePicker.seconds"===e){y="Sekunder"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="Merk alt"
 break A}if("keyboardToolbar.done"===e){y="Ferdig"
 break A}y=null
 break A}return y},
-bnU(d){return new A.aSM(d)},
-Zj:function Zj(d,e){var _=this
+bnY(d){return new A.aSQ(d)},
+Zm:function Zm(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aOG:function aOG(){},
-aSM:function aSM(d){this.a=d},
-aak:function aak(){}}
+aOI:function aOI(){},
+aSQ:function aSQ(d){this.a=d},
+aam:function aam(){}}
 B=c[0]
 A=a.updateHolder(c[54],A)
-A.Zj.prototype={
+A.Zm.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aOG()}return x},
+x=y.z=new A.aOI()}return x},
 gb9(){return this.r}}
-A.aOG.prototype={
+A.aOI.prototype={
 gbh(){return"Klipp ut"},
 gbg(){return"Kopier"},
 gbi(){return"Lim inn"},
 gbe(){return"Merk alt"}}
-A.aak.prototype={}
+A.aam.prototype={}
 var z=a.updateTypes([])
-A.aSM.prototype={
-$1(d){return A.bmA(this.a,d)},
+A.aSQ.prototype={
+$1(d){return A.bmE(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aak,B.a_)
-x(A.Zj,A.aak)
-x(A.aOG,B.aZ)
-x(A.aSM,B.aR)
-y(A.aak,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"Zj":{"a_":[]}}'))};
-(a=>{a["FItkJshyGKSFiRrZ10DyWbRXz9Q="]=a.current})($__dart_deferred_initializers__);
+x(A.aam,B.a_)
+x(A.Zm,A.aam)
+x(A.aOI,B.aZ)
+x(A.aSQ,B.aR)
+y(A.aam,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"Zm":{"a_":[]}}'))};
+(a=>{a["dxfp5XcaId/tbkpDUaRcP+6oIDQ="]=a.current})($__dart_deferred_initializers__);