Course enrollment status is a placeholder (TODO in curriculum panel)

[jeromehardaway]

Problem

src/containers/course-details/curriculam-panel.tsx contains: TODO: Replace with actual course enrollment check from database. Current enrollment indicator shown to users is not sourced from the Enrollment table.

Expected behavior

Enrollment status reflects the real Enrollment record for the current user + course.

Acceptance criteria

• Component queries (or receives via props from a server component) the user's active enrollment for the given course.
• "Enroll" vs "Continue" vs "Completed" states rendered correctly based on Enrollment.status.
• Works server-rendered (don't flash "Enroll" before fetching on the client).

Suggested approach

Fetch Enrollment in getServerSideProps for the course-detail page and pass enrollment state down as a prop. Don't hit the DB from the client.