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_87.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={
-b4u(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.Zn(v,u)
+b4y(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.Zq(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bnQ(u)
+v.r=A.bnU(u)
 return u},
-bmw(d,e){var y
+bmA(d,e){var y
 A:{if("timePicker.hours"===e){y="\u0b18\u0b23\u0b4d\u0b1f\u0b3e"
 break A}if("timePicker.minutes"===e){y="\u0b2e\u0b3f\u0b28\u0b3f\u0b1f"
 break A}if("timePicker.seconds"===e){y="\u0b38\u0b47\u0b15\u0b47\u0b23\u0b4d\u0b21"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="\u0b38\u0b2c\u0b41 \u0b1a\u0b5f\u0b28 \u0b1
 break A}if("keyboardToolbar.done"===e){y="\u0b38\u0b2e\u0b4d\u0b2a\u0b28\u0b4d\u0b28"
 break A}y=null
 break A}return y},
-bnQ(d){return new A.aSI(d)},
-Zn:function Zn(d,e){var _=this
+bnU(d){return new A.aSM(d)},
+Zq:function Zq(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aOK:function aOK(){},
-aSI:function aSI(d){this.a=d},
-aao:function aao(){}}
+aOM:function aOM(){},
+aSM:function aSM(d){this.a=d},
+aaq:function aaq(){}}
 B=c[0]
 A=a.updateHolder(c[58],A)
-A.Zn.prototype={
+A.Zq.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aOK()}return x},
+x=y.z=new A.aOM()}return x},
 gb9(){return this.r}}
-A.aOK.prototype={
+A.aOM.prototype={
 gbh(){return"\u0b15\u0b1f"},
 gbg(){return"\u0b15\u0b2a\u0b3f"},
 gbi(){return"\u0b2a\u0b47\u0b37\u0b4d\u0b1f"},
 gbe(){return"\u0b38\u0b2c\u0b41 \u0b1a\u0b5f\u0b28 \u0b15\u0b30\u0b28\u0b4d\u0b24\u0b41"}}
-A.aao.prototype={}
+A.aaq.prototype={}
 var z=a.updateTypes([])
-A.aSI.prototype={
-$1(d){return A.bmw(this.a,d)},
+A.aSM.prototype={
+$1(d){return A.bmA(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aao,B.a_)
-x(A.Zn,A.aao)
-x(A.aOK,B.aZ)
-x(A.aSI,B.aR)
-y(A.aao,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"Zn":{"a_":[]}}'))};
-(a=>{a["bq2FBlsdh0VB0lJSpRYvgOxDZzY="]=a.current})($__dart_deferred_initializers__);
+x(A.aaq,B.a_)
+x(A.Zq,A.aaq)
+x(A.aOM,B.aZ)
+x(A.aSM,B.aR)
+y(A.aaq,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"Zq":{"a_":[]}}'))};
+(a=>{a["O1qNc8KLgtoHr8ZxMti9hqVVi+g="]=a.current})($__dart_deferred_initializers__);