Enhance ISS and quake globe visual effects

Today was about making those two layers earn their place on the globe. The ISS is now a proper glowing sprite, with additive blending, so it looks like a bright cyan marker instead of a flat dot. Position updates are smoothed so the marker glides rather than snapping, and the trailing orbit line turns from solid to transparent over its length. If the satellite teleports (data gap or API glitch), the trail resets cleanly instead of drawing a spaghetti mess across the world. The quake layer got a bigger overhaul. I swapped the basic point rendering for a custom shader setup that gives each point a soft glow, a bright core, and a gentle breathing pulse based on elapsed time. New events now trigger pooled expanding ring pings that scale and fade out over a couple of seconds, so the globe feels alive when a fresh quake arrives. On first load, a handful of the most recent events are staggered across the first second to give an immediate sense of activity. The whole thing finally feels like a living dashboard rather than a static map.