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_99.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={
-b4G(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.Zz(v,u)
+b4K(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.ZC(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bnD(u)
+v.r=A.bnH(u)
 return u},
-bmj(d,e){var y
+bmn(d,e){var y
 A:{if("timePicker.hours"===e){y="Timmar"
 break A}if("timePicker.minutes"===e){y="Minuter"
 break A}if("timePicker.seconds"===e){y="Sekunder"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="Markera allt"
 break A}if("keyboardToolbar.done"===e){y="Klar"
 break A}y=null
 break A}return y},
-bnD(d){return new A.aSv(d)},
-Zz:function Zz(d,e){var _=this
+bnH(d){return new A.aSz(d)},
+ZC:function ZC(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aOW:function aOW(){},
-aSv:function aSv(d){this.a=d},
-aaA:function aaA(){}}
+aOY:function aOY(){},
+aSz:function aSz(d){this.a=d},
+aaC:function aaC(){}}
 B=c[0]
 A=a.updateHolder(c[70],A)
-A.Zz.prototype={
+A.ZC.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aOW()}return x},
+x=y.z=new A.aOY()}return x},
 gb9(){return this.r}}
-A.aOW.prototype={
+A.aOY.prototype={
 gbh(){return"Klipp ut"},
 gbg(){return"Kopiera"},
 gbi(){return"Klistra in"},
 gbe(){return"Markera allt"}}
-A.aaA.prototype={}
+A.aaC.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)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aaA,B.a_)
-x(A.Zz,A.aaA)
-x(A.aOW,B.aZ)
-x(A.aSv,B.aR)
-y(A.aaA,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"Zz":{"a_":[]}}'))};
-(a=>{a["kH8El4e/wPeR3UUpa4De+cjPTu8="]=a.current})($__dart_deferred_initializers__);
+x(A.aaC,B.a_)
+x(A.ZC,A.aaC)
+x(A.aOY,B.aZ)
+x(A.aSz,B.aR)
+y(A.aaC,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"ZC":{"a_":[]}}'))};
+(a=>{a["9Rt/hoTNGsuogc/M/HLXPMYaNsw="]=a.current})($__dart_deferred_initializers__);