fix(RegionMap.tsx): flip connection indicator angle by 180 degrees to point away from existing connections

frontend/src/components/RegionMap.tsx

@@ -242,6 +242,8 @@ export const RegionMap = ({ regionName, focusSystem, isCompact = false, isWormho
             for (let i = 0; i < key.length; i++) h = (h * 31 + key.charCodeAt(i)) >>> 0;
             angle = (h % 360) * (Math.PI / 180);
           }
+          // Flip 180° so indicator points away from existing connections
+          angle = angle + Math.PI;
 
           const gkey = `${fromName}__${toRegion}`;
           const prev = grouped.get(gkey);