Extends the earlier user-dashboard fix: canEditActive is renamed
canModifyActive and now also gates the "Make payment" and "Cancel
registration" actions, not just editing. Backend enforcement added to
cancelRegistration and createYocoCheckout to block past-event
self-service payment/cancellation server-side (cashup-closed events
were already blocked via assertEventOpen; admins/supervisors are
exempt from the past-date check, consistent with existing overrides).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
joshuaandClaude Sonnet 5
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