Request 512px tiles for better resolution, add subtle blur to smooth radar edges

MMM-CombinedMap.js

@@ -281,7 +281,7 @@ Module.register("MMM-CombinedMap", {
       const isForecast = timestamp > now;
       const timeStr = timestamp.toISOString().replace(/\.\d{3}Z$/, ".000Z");
       
-      // DWD WMS layer
+      // DWD WMS layer - request larger tiles for better quality
       const layer = L.tileLayer.wms("https://maps.dwd.de/geoserver/dwd/wms", {
         layers: "dwd:Niederschlagsradar",
         format: "image/png",
@@ -291,7 +291,9 @@ Module.register("MMM-CombinedMap", {
         styles: "niederschlagsradar",
         version: "1.3.0",
         crs: L.CRS.EPSG3857,
-        className: radarClass
+        className: radarClass,
+        tileSize: 512,  // Request larger tiles for better resolution
+        zoomOffset: -1  // Compensate for larger tiles
       });
       
       layer.addTo(this.map);