- New useDeleteEntity hook: publishes a kind:5 deletion request referencing
the target addressable event by `a` coord, `e` id, and `k` kind. Owner-only.
- New reusable DeleteEntityDialog: owner-gated trigger + confirmation with a
clear "deletion is best-effort on decentralized relays" warning, redirect,
and query invalidation so the item drops out of lists.
- Wired "Disband" into CrewDetailPage (founder only, redirects to /crews).
- Wired a "Manage → Delete Profile" card into CoachDetailPage for all Lab
profile types (coach/filmer/editor/photographer/builder), redirects to /lab.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
