Removed redundant staff profile not-found acceptance test

no ref

- review feedback: the loaded-profile-to-unknown-slug scenario largely
  duplicates the cold-load not-found test, which already covers the
  toast and staff-list redirect

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: sagzy

apps/admin-x-settings/test/acceptance/general/users/profile.test.ts

@@ -1029,30 +1029,4 @@ test.describe('Staff profile URLs', async () => {
         await expect(page.getByTestId('user-detail-modal')).not.toBeVisible();
     });
 
-    test('Shows an error when navigating from a loaded profile to an unknown slug', async ({page}) => {
-        const userToEdit = responseFixtures.users.users.find(user => user.email === 'administrator@test.com')!;
-
-        await mockApi({page, requests: {
-            ...globalDataRequests,
-            browseUsers: {method: 'GET', path: '/users/?limit=100&include=roles', response: responseFixtures.users},
-            getUserBySlug: {method: 'GET', path: `/users/slug/${userToEdit.slug}/?include=roles`, response: {
-                users: [userToEdit]
-            }},
-            getUnknownUserBySlug: {method: 'GET', path: '/users/slug/unknown-user/?include=roles', responseStatus: 404, response: {
-                errors: [{type: 'NotFoundError', message: 'Resource not found error, cannot read user.'}]
-            }}
-        }});
-
-        await page.goto(`/#/settings/staff/${userToEdit.slug}`);
-
-        const modal = page.getByTestId('user-detail-modal');
-        await expect(modal).toBeVisible();
-
-        // The already-loaded profile must not mask the failed lookup
-        await page.goto('/#/settings/staff/unknown-user');
-
-        await expect(page.getByTestId('toast-error').filter({hasText: 'User not found'})).toBeVisible();
-        await expect(page).toHaveURL(/#\/settings\/staff$/);
-        await expect(page.getByTestId('user-detail-modal')).not.toBeVisible();
-    });
 });