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_18.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={
-b3J(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
-u=new A.YC(v,u)
+b3N(d,e,f){var y,x,w=null,v=new B.a0(),u=new B.a0()
+u=new A.YF(v,u)
 u.bf(d,w,e,w)
 y=u.a
 x=v.r
 x.toString
 y.r=x
-v.r=A.boG(u)
+v.r=A.boK(u)
 return u},
-bnm(d,e){var y
+bnq(d,e){var y
 A:{if("timePicker.hours"===e){y="\u0998\u09a3\u09cd\u099f\u09be"
 break A}if("timePicker.minutes"===e){y="\u09ae\u09bf\u09a8\u09bf\u099f"
 break A}if("timePicker.seconds"===e){y="\u09b8\u09c7\u0995\u09c7\u09a8\u09cd\u09a1"
@@ -23,38 +23,38 @@ break A}if("input.selectAll"===e){y="\u09b8\u09ac \u09a8\u09bf\u09b0\u09cd\u09ac
 break A}if("keyboardToolbar.done"===e){y="\u09b8\u09ae\u09cd\u09aa\u09a8\u09cd\u09a8"
 break A}y=null
 break A}return y},
-boG(d){return new A.aTy(d)},
-YC:function YC(d,e){var _=this
+boK(d){return new A.aTC(d)},
+YF:function YF(d,e){var _=this
 _.r=d
 _.z=_.w=$
 _.a=e
 _.e=_.b=$},
-aNZ:function aNZ(){},
-aTy:function aTy(d){this.a=d},
-a9D:function a9D(){}}
+aO0:function aO0(){},
+aTC:function aTC(d){this.a=d},
+a9F:function a9F(){}}
 B=c[0]
 A=a.updateHolder(c[10],A)
-A.YC.prototype={
+A.YF.prototype={
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 return y==null?this.a.a4(e):y},
 gb4(){var y=this,x=y.z
 if(x===$){if(y.w===$)y.w=y
-x=y.z=new A.aNZ()}return x},
+x=y.z=new A.aO0()}return x},
 gb9(){return this.r}}
-A.aNZ.prototype={
+A.aO0.prototype={
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 gbg(){return"\u0995\u09aa\u09bf"},
 gbi(){return"\u09aa\u09c7\u09b8\u09cd\u099f"},
 gbe(){return"\u09b8\u09ac \u09a8\u09bf\u09b0\u09cd\u09ac\u09be\u099a\u09a8 \u0995\u09b0\u09c1\u09a8"}}
-A.a9D.prototype={}
+A.a9F.prototype={}
 var z=a.updateTypes([])
-A.aTy.prototype={
-$1(d){return A.bnm(this.a,d)},
+A.aTC.prototype={
+$1(d){return A.bnq(this.a,d)},
 $S:2};(function inheritance(){var y=a.mixin,x=a.inherit
-x(A.a9D,B.a_)
-x(A.YC,A.a9D)
-x(A.aNZ,B.aZ)
-x(A.aTy,B.aR)
-y(A.a9D,B.aX)})()
-B.b4(b.typeUniverse,JSON.parse('{"YC":{"a_":[]}}'))};
-(a=>{a["7UBh53VjcGsOM484yLmyfMHS+1M="]=a.current})($__dart_deferred_initializers__);
+x(A.a9F,B.a_)
+x(A.YF,A.a9F)
+x(A.aO0,B.aZ)
+x(A.aTC,B.aR)
+y(A.a9F,B.aX)})()
+B.b3(b.typeUniverse,JSON.parse('{"YF":{"a_":[]}}'))};
+(a=>{a["b8MOcbmm+guGp6kVdAxkfUwHL28="]=a.current})($__dart_deferred_initializers__);