Lift CAPTURED ARTIFACTS into its own section, taking the drawer
selection state with it (the parent shell no longer owns
artifact-modal state).
- New AttackerDetail/sections/ArtifactsPanel.tsx
Drawer is rendered as a sibling of the section so its z-index
and focus-trap behavior mirror the original.
- ArtifactsPanel.test.tsx covers row rendering with parsed SD
fields, empty state, missing stored_as (no OPEN button), and
the open/close cycle. ArtifactDrawer is vi.mock'd to a stub
so we don't need MSW handlers for its content fetch.
- AttackerDetail.tsx loses the artifact JSX block, the artifact
state, and now-unused Paperclip/Package/ArtifactDrawer imports.
