feat: increase portal detection range from 60m to 240m

60m was too narrow (~half a house). 240m matches the typical in-game
view distance for terrain features (1 AC coordinate unit = 240 game units).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

MosswartMassacre/PluginCore.cs

@@ -812,11 +812,11 @@ namespace MosswartMassacre
                 var decalCoords = portal.Coordinates();
                 if (decalCoords == null) return;
 
-                // Only report portals within 60 meters of the player
+                // Only report portals within 240 meters of the player
                 var portalPos = new Coordinates(decalCoords.EastWest, decalCoords.NorthSouth);
                 var playerPos = Coordinates.Me;
                 double dist = playerPos.DistanceToFlat(portalPos);
-                if (dist > 60.0) return;
+                if (dist > 240.0) return;
 
                 const string fmt = "F7";
                 string ns = decalCoords.NorthSouth.ToString(fmt, CultureInfo.InvariantCulture);