✨(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-member-create.spec.ts

@@ -227,7 +227,7 @@ test.describe('Document create member', () => {
     await page.getByRole('button', { name: 'Reader' }).click();
 
     const moreActions = userInvitation.getByRole('button', {
-      name: 'more_vert',
+      name: 'more_horiz',
     });
     await moreActions.click();