fix(ui): open options in the CachyLLaMA test

Use the existing helper so the test reaches its backend preference
assertions instead of failing with a ReferenceError.

Assisted-by: Codex:gpt-6

core/http/react-ui/e2e/import-form-ux-batch-d.spec.js

@@ -93,7 +93,7 @@ test.describe('Import form UX — Batch D (progressive disclosure)', () => {
   })
 
   test('D1 — selecting cachyllama shows GGUF Quantizations + MMProj', async ({ page }) => {
-    await enterPowerPreferences(page)
+    await openOptions(page)
     await selectBackend(page, 'cachyllama')
     await expect(quantizationsInput(page)).toBeVisible()
     await expect(mmprojInput(page)).toBeVisible()