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_30.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={
-b3P(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.YI(v,u)
+b3T(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.YL(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.boz(u)
+v.r=A.boD(u)
 return u},
-bnf(d,e){var y
+bnj(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="V\xe6lg alt"
 break A}if("keyboardToolbar.done"===e){y="F\xe6rdig"
 break A}y=null
 break A}return y},
-boz(d){return new A.aTr(d)},
-YI:function YI(d,e){var _=this
+boD(d){return new A.aTv(d)},
+YL:function YL(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aO4:function aO4(){},
-aTr:function aTr(d){this.a=d},
-a9J:function a9J(){}}
+aO6:function aO6(){},
+aTv:function aTv(d){this.a=d},
+a9L:function a9L(){}}
 B=c[0]
 A=a.updateHolder(c[16],A)
-A.YI.prototype={
+A.YL.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aO4()}return x},
+x=y.z=new A.aO6()}return x},
 gb9(){return this.r}}
-A.aO4.prototype={
+A.aO6.prototype={
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 gbg(){return"Kopi\xe9r"},
 gbi(){return"S\xe6t ind"},
 gbe(){return"V\xe6lg alt"}}
-A.a9J.prototype={}
+A.a9L.prototype={}
 var z=a.updateTypes([])
-A.aTr.prototype={
-$1(d){return A.bnf(this.a,d)},
+A.aTv.prototype={
+$1(d){return A.bnj(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.a9J,B.a_)
-x(A.YI,A.a9J)
-x(A.aO4,B.aZ)
-x(A.aTr,B.aR)
-y(A.a9J,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"YI":{"a_":[]}}'))};
-(a=>{a["ciAXJvWghrtHO2NLp09lmuYj3n8="]=a.current})($__dart_deferred_initializers__);
+x(A.a9L,B.a_)
+x(A.YL,A.a9L)
+x(A.aO6,B.aZ)
+x(A.aTv,B.aR)
+y(A.a9L,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"YL":{"a_":[]}}'))};
+(a=>{a["KYT18sIL9r1dnoa7Aw4TXHucjpI="]=a.current})($__dart_deferred_initializers__);