fix: Reduce spidering nearbyDistance to prevent grouping distant markers

- Reduced nearbyDistance from 100 to 20 pixels to only spider truly overlapping markers
- Added spiderfyDistanceMultiplier: 2 to increase separation when markers do spider
- Added leg color configuration for better visibility
- Fixes issue where distant markers like K5FDT-R were incorrectly grouped with AE5PL stations

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

assets/js/map.ts

@@ -571,9 +571,14 @@ let MapAPRSMap = {
     if (typeof window.OverlappingMarkerSpiderfier !== "undefined") {
       self.oms = new window.OverlappingMarkerSpiderfier(self.map, {
         keepSpiderfied: true,
-        nearbyDistance: 100,
+        nearbyDistance: 20,
         circleSpiralSwitchover: 15,
         legWeight: 2,
+        legColors: {
+          usual: '#222',
+          highlighted: '#f00'
+        },
+        spiderfyDistanceMultiplier: 2
       });
 
       // Add click handler for spiderfied markers