Symptom

If the API returns an error for GET /courses/:id, the frontend crashes with TypeError: Cannot read properties of undefined (reading 'clientName') instead of showing a clean error message.

Expected: The error handler should format the error with the client name, e.g., "[CourseApiClient] HTTP 404: Not Found".

Context

CourseApiClient extends BaseApiClient. The handleError method on the base class references this.clientName to build a formatted error message. The fetchCourse method catches errors from the HTTP call.