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_78.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={
-b4m(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.Zf(v,u)
+b4q(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.Zi(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bnZ(u)
+v.r=A.bo2(u)
 return u},
-bmF(d,e){var y
+bmJ(d,e){var y
 A:{if("timePicker.hours"===e){y="\u0426\u0430\u0433"
 break A}if("timePicker.minutes"===e){y="\u041c\u0438\u043d\u0443\u0442"
 break A}if("timePicker.seconds"===e){y="\u0421\u0435\u043a\u0443\u043d\u0434"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="\u0411\u04af\u0433\u0434\u0438\u0439\u0433
 break A}if("keyboardToolbar.done"===e){y="\u0411\u043e\u043b\u0441\u043e\u043d"
 break A}y=null
 break A}return y},
-bnZ(d){return new A.aSR(d)},
-Zf:function Zf(d,e){var _=this
+bo2(d){return new A.aSV(d)},
+Zi:function Zi(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aOC:function aOC(){},
-aSR:function aSR(d){this.a=d},
-aag:function aag(){}}
+aOE:function aOE(){},
+aSV:function aSV(d){this.a=d},
+aai:function aai(){}}
 B=c[0]
 A=a.updateHolder(c[50],A)
-A.Zf.prototype={
+A.Zi.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aOC()}return x},
+x=y.z=new A.aOE()}return x},
 gb9(){return this.r}}
-A.aOC.prototype={
+A.aOE.prototype={
 gbh(){return"\u0422\u0430\u0439\u0440\u0430\u0445"},
 gbg(){return"\u0425\u0443\u0443\u043b\u0430\u0445"},
 gbi(){return"\u0411\u0443\u0443\u043b\u0433\u0430\u0445"},
 gbe(){return"\u0411\u04af\u0433\u0434\u0438\u0439\u0433 \u0441\u043e\u043d\u0433\u043e\u0445"}}
-A.aag.prototype={}
+A.aai.prototype={}
 var z=a.updateTypes([])
-A.aSR.prototype={
-$1(d){return A.bmF(this.a,d)},
+A.aSV.prototype={
+$1(d){return A.bmJ(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aag,B.a_)
-x(A.Zf,A.aag)
-x(A.aOC,B.aZ)
-x(A.aSR,B.aR)
-y(A.aag,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"Zf":{"a_":[]}}'))};
-(a=>{a["yleOAREkFdOx2eUyxeAotvcGBo8="]=a.current})($__dart_deferred_initializers__);
+x(A.aai,B.a_)
+x(A.Zi,A.aai)
+x(A.aOE,B.aZ)
+x(A.aSV,B.aR)
+y(A.aai,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"Zi":{"a_":[]}}'))};
+(a=>{a["g5DFsorU2fanYzd4M6o+Gh8o65w="]=a.current})($__dart_deferred_initializers__);