Broadcasts had no delete path (Phase 1 gap) — had to remove a test
message via a one-off script yesterday. New admin.deleteBroadcast
mutation mirrors hidePost/banOwner: SUPER_ADMIN-gated (same bar as
createBroadcast), reason required (min 1 char), wraps delete + a
DELETE_BROADCAST ModerationLog entry in one transaction.
BroadcastReceipt rows cascade via the existing onDelete: Cascade.
Frontend: trash icon per history item opens a confirm dialog with a
required reason input, mirroring the posts admin page's delete-confirm
pattern.
admin
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