* Add zoom-aware symbology, fix globe popovers, expand geo coverage
Map rendering improvements based on user feedback:
- Globe markers now scale with camera altitude (onZoom hook)
- Priority-based visibility culls low-priority markers at world view
- Globe popovers use getScreenCoords for accurate positioning
- Flat map labels hidden at low zoom, revealed progressively
- Default globe altitude lowered from 2.5 to 1.8 for better fill
- Americas region zoom tightened to CONUS focus
Geographic coverage expansion:
- 4 new OpenSky air theaters: Caribbean, Gulf of Guinea, Cape Route, Horn of Africa
- Flight corridors now span Americas and Africa
- NOAA alerts extract centroid lat/lon from GeoJSON geometry
- EPA RadNet stations geocoded with hardcoded coords for 10 US cities
- ISS + Tiangong positions estimated from TLE orbital elements
- GDELT geoEvents() now called in briefing for mapped event points
- New legend entries: Weather Alert, EPA RadNet, Space Station, GDELT Event
* Fix null-safe coordinate checks and remove injected data blob
- Use `!= null` instead of truthy checks for lat/lon in noaa.mjs
and inject.mjs so valid 0-coordinates (equator/prime meridian)
are not silently dropped
- Reset jarvis.html `let D` back to null placeholder so generated
runtime data is not part of the PR diff
* Remove re-injected data blob from jarvis.html
Reset let D back to null — previous commit was correct but
inject.mjs build verification re-injected the payload.
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