Render event based on user registration status

[trista-chen-29]

Closes #2097

Backend dependency

Relies on SCEvents returning registration_status in the events response (JWT-authenticated).

Changes

• Attach JWT token to SCEvents API requests (getAllSCEvents, getEventByID)
• Enable user-specific event data (e.g. registration_status)
• Update CalendarView popup:
  • Registered → disabled CTA
  • Pending → disabled CTA
  • Rejected → unavailable state
• Add full-page status views in EventRegistration:
  • Registered
  • Pending
  • Waitlisted (UI support, not full logic)
  • Rejected (UI support, not full logic)
• Refactor status UI into reusable StatusPanel component

Screenshots

Register

This event was created earlier and has no registration form fields, but users can still register. Shown immediately after a user submits a registration request. The duration depends on backend processing time.

Registration unavailable

Notes

• Enables personalized event data via authenticated requests
• Without JWT, registration_status is not returned by backend
• Waitlist and rejection behavior depend on backend logic and related PRs

[steeevin88]

nice thanks!