✨(frontend) improve screen reader support in DocShare modal

adds relevant aria-labels to enhance accessibility for assistive technologies

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

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

@@ -226,7 +226,7 @@ test.describe('Doc Tree', () => {
     const currentUser = list.getByTestId(
       `doc-share-member-row-user.test@${browserName}.test`,
     );
-    const currentUserRole = currentUser.getByLabel('doc-role-dropdown');
+    const currentUserRole = currentUser.getByTestId('doc-role-dropdown');
     await currentUserRole.click();
     await page.getByRole('menuitem', { name: 'Administrator' }).click();
     await list.click();