Archive is a rare, deliberate action — it doesn't deserve real estate next
to navigation / common actions on the project view. Move it from the
prominent entity-detail-footer button into the bottom of the Edit Project
modal as a tertiary btn-link-danger inside a visually separated
.modal-danger-zone (top-bordered section, right-aligned).
The visibility wiring (project-delete-wrap, admin-gated in renderHeader)
and click handler (project-delete-btn → delete-modal confirm flow) keep
the same DOM ids, so the existing confirm-modal and POST behaviour are
unchanged. Backend (/api/projects/{id} status=archived) untouched.