fix(ui/button): 修复按钮预制体的Label组件丢失问题

将原本被误删的按钮文字Label组件及其依赖组件重新添加回预制体，修正了按钮显示异常的问题。同时附带更新了关联的资源图片ui3.png。

assets/resources/gui/auie/button.prefab

@@ -785,10 +785,10 @@
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@@ -1008,28 +847,28 @@
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@@ -1441,23 +1280,23 @@
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@@ -1865,6 +1704,167 @@
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