Backend: add 7 new data feeds to _fetch_overview() (33 total SSE streams).
Frontend: alert banner (critical/high/medium), health outbreak tracker,
election calendar with risk bars, shipping stress gauge, social signals
from Reddit, nuclear test site map layer with concern scoring, weekly
trends with anomaly tracking. New HUD pills for alerts, shipping stress,
outbreaks, nuclear flags.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
