fix(decorate): show page settings header for custom page scene (1004)

Previously only mall home decoration (scene 1001) displayed the page
settings widget. Custom page editing (scene 1004) now shows it as well;
category template (1007) remains excluded.

Made-with: Cursor

src/view/decorate/index.vue

@@ -234,8 +234,10 @@ export default {
       }
     },
     headerVisible() {
-      // 仅商城装修(1001)展示页面设置挂件，1007 分类模版等不展示
-      return this.mode == 'page' && this.localScene == '1001'
+      // 商城装修(1001)、自定义页(1004)展示页面设置挂件；1007 分类模版等不展示
+      return (
+        this.mode == 'page' && (this.localScene == '1001' || this.localScene == '1004')
+      )
     },
     widgetCategories() {
       // 通用挂件：轮播、热区图、视频、文字轮播