fix(grayline): Remove edge closure logic that created unwanted box

The edge closure was creating an incorrect polygon connecting
across the bottom of the map. Reverted to simple polygon creation
between upper and lower segments.

Need different approach for wrapping.

src/plugins/layers/useGrayLine.js

@@ -631,44 +631,9 @@ export function useLayer({ enabled = false, opacity = 0.5, map = null }) {
           const lowerSeg = lowerSegments[i];
           
           if (upperSeg.length > 1 && lowerSeg.length > 1) {
-            // Get the longitude range for this segment
-            const segLons = upperSeg.map(p => p[1]);
-            const segMinLon = Math.min(...segLons);
-            const segMaxLon = Math.max(...segLons);
-            
             // Create polygon from upper segment + reversed lower segment
-            let enhancedZone = [...upperSeg, ...lowerSeg.reverse()];
+            // This creates a closed shape between the two lines
-            
+            const enhancedZone = [...upperSeg, ...lowerSeg.slice().reverse()];
-            // If this segment is at a map edge (near ±180°), close it properly
-            // by extending to the map bounds
-            const isWestEdge = segMinLon < -170;  // Near -180°
-            const isEastEdge = segMaxLon > 170;   // Near +180°
-            
-            if (isWestEdge || isEastEdge) {
-              // Get the latitude range
-              const lats = enhancedZone.map(p => p[0]);
-              const maxLat = Math.max(...lats);
-              const minLat = Math.min(...lats);
-              
-              // Close the polygon by adding corner points at the map edge
-              if (isWestEdge) {
-                // Add corners at -180°
-                const firstLat = enhancedZone[0][0];
-                const lastLat = enhancedZone[enhancedZone.length - 1][0];
-                enhancedZone.push([lastLat, -180]);
-                enhancedZone.push([maxLat, -180]);
-                enhancedZone.push([firstLat, -180]);
-              }
-              
-              if (isEastEdge) {
-                // Add corners at +180°
-                const firstLat = enhancedZone[0][0];
-                const lastLat = enhancedZone[enhancedZone.length - 1][0];
-                enhancedZone.push([lastLat, 180]);
-                enhancedZone.push([maxLat, 180]);
-                enhancedZone.push([firstLat, 180]);
-              }
-            }
             
             // Debug: Show longitude range of this polygon
             const polyLons = enhancedZone.map(p => p[1]);
@@ -679,9 +644,7 @@ export function useLayer({ enabled = false, opacity = 0.5, map = null }) {
               upperPoints: upperSeg.length,
               lowerPoints: lowerSeg.length,
               totalPolygonPoints: enhancedZone.length,
-              lonRange: `${polyMinLon.toFixed(1)} to ${polyMaxLon.toFixed(1)}`,
+              lonRange: `${polyMinLon.toFixed(1)} to ${polyMaxLon.toFixed(1)}`
-              isWestEdge,
-              isEastEdge
             });
             
             const enhancedPoly = L.polygon(enhancedZone, {