update

src/lib/cards/MapCard/CreateMapCardModal.svelte

···
 
 				if (!data.lat || !data.lon) throw new Error('lat or lon not found');
 
-				item.cardData.lat = parseFloat(data.lat);
-				item.cardData.lon = parseFloat(data.lon);
+				item.cardData.lat = data.lat;
+				item.cardData.lon = data.lon;
 			} else {
 				throw new Error('response not ok');
 			}

src/lib/cards/MapCard/Map.svelte

···
 			// @ts-ignore
 			leaflet = await import('leaflet');
 
-			const location = [item.cardData.lat, item.cardData.lon];
+			const location = [parseFloat(item.cardData.lat), parseFloat(item.cardData.lon)];
 
 			lMap = leaflet
 				.map(map, {

src/routes/api/geocoding/+server.ts

···
 	}
 
 	try {
-		const data = await fetch(
-			'https://nominatim.openstreetmap.org/search?format=json&q=' + encodeURIComponent(q)
-		);
+		const url = 'https://nominatim.openstreetmap.org/search?format=json&q=' + encodeURIComponent(q);
+		console.log(url);
+		const data = await fetch(url);
 		const location = await data.json();
 
 		return json(location[0]);