Adds proper /identities and /campaigns list pages following the
Bounty/Attackers convention (page-header + page-title-group +
controls-row + logs-section + logs-table + EmptyState). Both pages
live-update via the existing identity / campaign SSE streams.
Sidebar: Attackers, Identities, Campaigns now group under a
THREAT DATA NavGroup, matching the SWARM grouping pattern.
CampaignDetail and IdentityDetail rewritten to use the house class
system (page-header / logs-section / chip / dim-chip) instead of
inline styles. The campaign chip on IdentityDetail navigates to
/campaigns/:uuid; both pages share a small fp-group helper for
fingerprint listings (added to Dashboard.css).
