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_59.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={
-b48(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.Z1(v,u)
+b4c(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.Z4(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bod(u)
+v.r=A.boh(u)
 return u},
-bmU(d,e){var y
+bmY(d,e){var y
 A:{if("timePicker.hours"===e){y="Klukkustundir"
 break A}if("timePicker.minutes"===e){y="M\xedn\xfatur"
 break A}if("timePicker.seconds"===e){y="Sek\xfandur"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="Velja allt"
 break A}if("keyboardToolbar.done"===e){y="Loki\xf0"
 break A}y=null
 break A}return y},
-bod(d){return new A.aT5(d)},
-Z1:function Z1(d,e){var _=this
+boh(d){return new A.aT9(d)},
+Z4:function Z4(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aOo:function aOo(){},
-aT5:function aT5(d){this.a=d},
-aa2:function aa2(){}}
+aOq:function aOq(){},
+aT9:function aT9(d){this.a=d},
+aa4:function aa4(){}}
 B=c[0]
 A=a.updateHolder(c[36],A)
-A.Z1.prototype={
+A.Z4.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aOo()}return x},
+x=y.z=new A.aOq()}return x},
 gb9(){return this.r}}
-A.aOo.prototype={
+A.aOq.prototype={
 gbh(){return"Klippa"},
 gbg(){return"Afrita"},
 gbi(){return"L\xedma"},
 gbe(){return"Velja allt"}}
-A.aa2.prototype={}
+A.aa4.prototype={}
 var z=a.updateTypes([])
-A.aT5.prototype={
-$1(d){return A.bmU(this.a,d)},
+A.aT9.prototype={
+$1(d){return A.bmY(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aa2,B.a_)
-x(A.Z1,A.aa2)
-x(A.aOo,B.aZ)
-x(A.aT5,B.aR)
-y(A.aa2,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"Z1":{"a_":[]}}'))};
-(a=>{a["My2RshXDg4SzLzT4oACVPyL+TQw="]=a.current})($__dart_deferred_initializers__);
+x(A.aa4,B.a_)
+x(A.Z4,A.aa4)
+x(A.aOq,B.aZ)
+x(A.aT9,B.aR)
+y(A.aa4,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"Z4":{"a_":[]}}'))};
+(a=>{a["Et32Ot6zQXVAO1ITyKHqRpYoXq0="]=a.current})($__dart_deferred_initializers__);