✨(frontend) improve modal a11y: structure, labels, and title

added aria-label, structured text in p, and added title for better accessibility

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

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

@@ -100,7 +100,7 @@ test.describe('Doc Header', () => {
 
     await page
       .getByRole('button', {
-        name: 'Confirm deletion',
+        name: 'Delete document',
       })
       .click();