test: improve locator of sidebar collapser (#34066)

apps/meteor/tests/e2e/feature-preview.spec.ts

@@ -153,7 +153,7 @@ test.describe.serial('feature preview', () => {
 			await poHomeChannel.sidebar.markItemAsUnread(item);
 			await poHomeChannel.sidebar.escSearch();
 
-			const collapser = poHomeChannel.sidebar.firstCollapser;
+			const collapser = poHomeChannel.sidebar.getCollapseGroupByName('Channels');
 			await collapser.click();
 
 			await expect(poHomeChannel.sidebar.getItemUnreadBadge(collapser)).toBeVisible();

apps/meteor/tests/e2e/page-objects/fragments/sidebar.ts

@@ -76,7 +76,7 @@ export class Sidebar {
 	}
 
 	getCollapseGroupByName(name: string): Locator {
-		return this.channelsList.getByRole('button', { name, exact: true });
+		return this.channelsList.getByRole('button').filter({ has: this.page.getByRole('heading', { name, exact: true }) });
 	}
 
 	getItemUnreadBadge(item: Locator): Locator {