✨(frontend) set empty alt for decorative images in blocknote editor

ensure decorative images have empty alt to comply with RGAA 1.2 accessibility

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

src/frontend/apps/e2e/__tests__/app-impress/config.spec.ts

@@ -43,7 +43,9 @@ test.describe('Config', () => {
       path.join(__dirname, 'assets/logo-suite-numerique.png'),
     );
 
-    const image = page.getByRole('img', { name: 'logo-suite-numerique.png' });
+    const image = page
+      .locator('.--docs--editor-container img.bn-visual-media')
+      .first();
 
     await expect(image).toBeVisible();