When the Resource Optimization plugin is configured with invalid hybrid cloud service account credentials (clientId/clientSecret), the UI silently shows an empty table with "No records to display" instead of displaying a clear error message about the authentication failure.

Expected:

• UI should display an error banner or message indicating that the hybrid cloud API authentication has failed
• The error should be actionable (e.g., "Unable to authenticate with the hybrid cloud console. Please check your service account credentials.")

Actual:

• UI shows "Optimizable containers (0)" and "No records to display"
• No error message, warning banner, or indication that anything is wrong
• User/admin cannot distinguish between "no data available" and "credentials are invalid"

Backend logs DO show errors:

redhat-resource-optimization error Request failed with status 500 Unauthorized
GET /api/redhat-resource-optimization/token HTTP/1.1 500
GET /api/proxy/cost-management/v1/recommendations/openshift 401

Steps to reproduce:
1. Configure ROS plugin with invalid clientId and clientSecret
2. Restart Backstage
3. Log in as a user with RORead permission
4. Navigate to Resource Optimization page
5. Observe empty table with no error message

Environment: RHDH 1.9.0, plugin version 1.3.2-rc.1

Related test cases: FLPATH-3119, FLPATH-3136