fix editor double overflow scroll

src/Umbraco.Web.UI.Client/src/app.ts

@@ -15,6 +15,10 @@ import { internalManifests } from './temp-internal-manifests';
 @customElement('umb-app')
 export class UmbApp extends UmbContextProviderMixin(LitElement) {
 	static styles = css`
+		:host {
+			overflow: hidden;
+		}
+
 		:host,
 		#router-slot {
 			display: block;

src/Umbraco.Web.UI.Client/src/backoffice/components/backoffice-main.element.ts

@@ -17,6 +17,7 @@ export class UmbBackofficeMain extends UmbContextConsumerMixin(LitElement) {
 				display: block;
 				width: 100%;
 				height: 100%;
+				overflow: hidden;
 			}
 		`,
 	];

src/Umbraco.Web.UI.Client/src/backoffice/editors/extensions/editor-extensions.element.ts

@@ -49,6 +49,7 @@ export class UmbEditorExtensionsElement extends UmbContextConsumerMixin(LitEleme
 	render() {
 		return html`
 			<umb-editor-entity alias="Umb.Editor.Extensions">
+				<h3 slot="name">Extensions</h3>
 				<uui-box headline="Extensions">
 					<uui-table>
 						<uui-table-head>

src/Umbraco.Web.UI.Client/src/backoffice/editors/shared/editor-layout/editor-layout.element.ts

@@ -34,7 +34,6 @@ export class UmbEditorLayout extends LitElement {
 				display: flex;
 				flex: 1;
 				flex-direction: column;
-				gap: 16px;
 			}
 
 			#footer {