✨(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-grid.spec.ts

@@ -113,7 +113,7 @@ test.describe('Document grid item options', () => {
     await removeButton.click();
 
     await expect(
-      page.locator('h2').getByText(`Deleting the document "${docs[0].title}"`),
+      page.getByRole('heading', { name: 'Delete a doc' }),
     ).toBeVisible();
 
     await page