moveend aborts in-flight overlay JSON and skips work when the 0.01° cell
is unchanged. Live aircraft/trains/vessels diff-update by id. Camera popup
HTML is built on open. Alert/perimeter polygons paint on canvas.
Reuse one TLS pool for overlay upstreams (8s/3s timeouts). Gzip JSON
over 1 KB. Aircraft/vessels Cache-Control max-age=5, alerts/perimeters 30.
Lifespan replaces deprecated on_event startup.
Heatmap uses {lat,lon,i,c}. Camera list drops URLs (detail via GET
/api/cameras/{id}). Event blips skip body. News omits content unless
include_content=true.
World view no longer fetches cameras/NWS/WFIGS. Default Blue Marble so init
does not wait on GIBS times. News/summary/events load with their views.
hls.min.js loads only on the first HLS camera popup.
