Makes it much clearer which vehicle is being tracked on the map by adding
two animated concentric rings that pulse outward from the selected marker.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Automatically connects to gpsd on page load if available. Updates
observer location in real-time with GPS indicator in top bar.
Includes auto-reconnect on visibility change.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>