✅(e2e) reduce flakiness in e2e tests

Flakiness in e2e tests has been reduced by:
- Adding waits for media-check processing in image tests.
- Ensuring that slash menu resets are handled
correctly to avoid flakiness.
- Wait for the Download button to be stable before clicking

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

@@ -116,11 +116,7 @@ test.describe('Doc Version', () => {
     await expect(panel).toBeVisible();
 
     await expect(page.getByText('History', { exact: true })).toBeVisible();
-    await expect(page.getByRole('status')).toBeVisible();
-    await expect(page.getByRole('status')).toBeHidden();
-    const items = await panel.locator('.version-item').all();
-    expect(items.length).toBe(1);
-    await items[0].click();
+    await panel.getByRole('button', { name: 'version item' }).click();
 
     await expect(modal.getByText('World')).toBeHidden();