✨(frontend) enhance document interaction tests

- Updated test cases to improve accessibility by replacing 'more_vert'
with 'more_horiz' for action buttons across various components.
- Refactored document deletion confirmation messages to use consistent
heading roles for better visibility.
- Simplified keyboard interactions in document table content tests for
improved clarity.
- Adjusted visibility checks for the share button to utilize more
descriptive labels.
- Cleaned up test code for maintainability and consistency.

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

@@ -172,7 +172,7 @@ test.describe('Doc Visibility: Restricted', () => {
     await page.goto(urlDoc);
 
     await verifyDocName(page, docTitle);
-    await expect(page.getByRole('button', { name: 'Share' })).toBeVisible();
+    await expect(page.getByLabel('Share button')).toBeVisible();
   });
 });