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_36.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={
-b3R(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.YK(v,u)
+b3V(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.YN(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.box(u)
+v.r=A.boB(u)
 return u},
-bnd(d,e){var y
+bnh(d,e){var y
 A:{if("timePicker.hours"===e){y="\u038f\u03c1\u03b5\u03c2"
 break A}if("timePicker.minutes"===e){y="\u039b\u03b5\u03c0\u03c4\u03ac"
 break A}if("timePicker.seconds"===e){y="\u0394\u03b5\u03c5\u03c4\u03b5\u03c1\u03cc\u03bb\u03b5\u03c0\u03c4\u03b1"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="\u0395\u03c0\u03b9\u03bb\u03bf\u03b3\u03ae
 break A}if("keyboardToolbar.done"===e){y="\u03a4\u03ad\u03bb\u03bf\u03c2"
 break A}y=null
 break A}return y},
-box(d){return new A.aTp(d)},
-YK:function YK(d,e){var _=this
+boB(d){return new A.aTt(d)},
+YN:function YN(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aO6:function aO6(){},
-aTp:function aTp(d){this.a=d},
-a9L:function a9L(){}}
+aO8:function aO8(){},
+aTt:function aTt(d){this.a=d},
+a9N:function a9N(){}}
 B=c[0]
 A=a.updateHolder(c[18],A)
-A.YK.prototype={
+A.YN.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aO6()}return x},
+x=y.z=new A.aO8()}return x},
 gb9(){return this.r}}
-A.aO6.prototype={
+A.aO8.prototype={
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 gbg(){return"\u0391\u03bd\u03c4\u03b9\u03b3\u03c1\u03b1\u03c6\u03ae"},
 gbi(){return"\u0395\u03c0\u03b9\u03ba\u03cc\u03bb\u03bb\u03b7\u03c3\u03b7"},
 gbe(){return"\u0395\u03c0\u03b9\u03bb\u03bf\u03b3\u03ae \u03cc\u03bb\u03c9\u03bd"}}
-A.a9L.prototype={}
+A.a9N.prototype={}
 var z=a.updateTypes([])
-A.aTp.prototype={
-$1(d){return A.bnd(this.a,d)},
+A.aTt.prototype={
+$1(d){return A.bnh(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.a9L,B.a_)
-x(A.YK,A.a9L)
-x(A.aO6,B.aZ)
-x(A.aTp,B.aR)
-y(A.a9L,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"YK":{"a_":[]}}'))};
-(a=>{a["X6VSwrsK33egCvXSEbDV8oj/es0="]=a.current})($__dart_deferred_initializers__);
+x(A.a9N,B.a_)
+x(A.YN,A.a9N)
+x(A.aO8,B.aZ)
+x(A.aTt,B.aR)
+y(A.a9N,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"YN":{"a_":[]}}'))};
+(a=>{a["RWYHu6P0hdMpkrOKGJKrZG24g5c="]=a.current})($__dart_deferred_initializers__);