Lift STORED MAIL into its own section and pull the mail drawer
selection state along with it. Section signals admin-gating
through the section's own props (mailForbidden), since the data
hook already converts a 403 into that boolean.
- New AttackerDetail/sections/MailLogPanel.tsx
- MailLogPanel.test.tsx covers row rendering, mailForbidden empty
state, no-mail empty state, from_hdr/from_addr/mail_from
fallback, and drawer open/close. MailDrawer vi.mock'd same as
ArtifactDrawer.
- AttackerDetail.tsx loses the mail JSX block, mailItem state,
and now-unused Mail/MailDrawer imports.