✨(frontend) hide decorative icons from assistive tech with aria-hidden

improves accessibility by reducing screen reader noise from icon elements

Signed-off-by: Cyril <c.gromoff@gmail.com>

src/frontend/apps/e2e/__tests__/app-impress/utils-sub-pages.ts

@@ -63,5 +63,5 @@ export const clickOnAddRootSubPage = async (page: Page) => {
   const rootItem = page.getByTestId('doc-tree-root-item');
   await expect(rootItem).toBeVisible();
   await rootItem.hover();
-  await rootItem.getByRole('button', { name: 'add_box' }).click();
+  await rootItem.getByRole('button', { name: /add subpage/i }).click();
 };