test(frontend): align Grok API key placeholder assertion

frontend/src/components/account/__tests__/CreateAccountModal.grok.spec.ts

@@ -14,7 +14,8 @@ describe('CreateAccountModal Grok account types', () => {
     expect(source).toContain("newPlatform === 'grok'")
     expect(source).toContain("? 'https://api.x.ai/v1'")
     expect(source).toContain("form.platform === 'grok'")
-    expect(source).toContain("? 'xai-...'")
+    expect(source).toContain(':placeholder="apiKeyValuePlaceholder"')
+    expect(source).toContain("return 'xai-...'")
   })
 
   it('exposes custom upstream URL and header override for the OAuth create flow', () => {