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_107.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={
-b4N(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.ZG(v,u)
+b4R(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.ZJ(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.bor(u)
+v.r=A.bov(u)
 return u},
-bn7(d,e){var y
+bnb(d,e){var y
 A:{if("timePicker.hours"===e){y="\u0633\u0627\u0626\u06d5\u062a"
 break A}if("timePicker.minutes"===e){y="\u0645\u0649\u0646\u06c7\u062a"
 break A}if("timePicker.seconds"===e){y="\u0633\u06d0\u0643\u06c7\u0646\u062a"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="\u06be\u06d5\u0645\u0645\u0649\u0646\u0649
 break A}if("keyboardToolbar.done"===e){y="\u062a\u0627\u0645\u0627\u0645"
 break A}y=null
 break A}return y},
-bor(d){return new A.aTj(d)},
-ZG:function ZG(d,e){var _=this
+bov(d){return new A.aTn(d)},
+ZJ:function ZJ(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aP2:function aP2(){},
-aTj:function aTj(d){this.a=d},
-aaH:function aaH(){}}
+aP4:function aP4(){},
+aTn:function aTn(d){this.a=d},
+aaJ:function aaJ(){}}
 B=c[0]
 A=a.updateHolder(c[77],A)
-A.ZG.prototype={
+A.ZJ.prototype={
 h(d,e){var y=this.r.a4(e)
 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aP2()}return x},
+x=y.z=new A.aP4()}return x},
 gb9(){return this.r}}
-A.aP2.prototype={
+A.aP4.prototype={
 gbh(){return"\u0643\u06d5\u0633"},
 gbg(){return"\u0643\u06c6\u0686\u06c8\u0631"},
 gbi(){return"\u0686\u0627\u067e\u0644\u0627"},
 gbe(){return"\u06be\u06d5\u0645\u0645\u0649\u0646\u0649 \u062a\u0627\u0644\u0644\u0627"}}
-A.aaH.prototype={}
+A.aaJ.prototype={}
 var z=a.updateTypes([])
-A.aTj.prototype={
-$1(d){return A.bn7(this.a,d)},
+A.aTn.prototype={
+$1(d){return A.bnb(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.aaH,B.a_)
-x(A.ZG,A.aaH)
-x(A.aP2,B.aZ)
-x(A.aTj,B.aR)
-y(A.aaH,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"ZG":{"a_":[]}}'))};
-(a=>{a["xITJifgHjUoh/3FDbJl9CJCvSXs="]=a.current})($__dart_deferred_initializers__);
+x(A.aaJ,B.a_)
+x(A.ZJ,A.aaJ)
+x(A.aP4,B.aZ)
+x(A.aTn,B.aR)
+y(A.aaJ,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"ZJ":{"a_":[]}}'))};
+(a=>{a["Db5gEvpX8HjXYvAuG46wMX78phU="]=a.current})($__dart_deferred_initializers__);