feat(earth): satellite dot rendering with hover/lock rings, dim cables when satellite locked

- Change satellite points from squares to circular dots
- Add hover ring (white) and lock ring (yellow) for satellites
- Fix satellite hover/lock ring state management
- Dim all cables when satellite is locked
- Increase MAX_SATELLITES to 2000
- Fix satIntersects scoping bug

frontend/public/earth/js/constants.js

@@ -6,7 +6,7 @@ export const CONFIG = {
   minZoom: 0.5,
   maxZoom: 5.0,
   earthRadius: 100,
-  rotationSpeed: 0.002,
+  rotationSpeed: 0.0005,
 };
 
 // Earth coordinate constants