feat(app): add manual entry and sharing flows

lib/core/utils/distance_calculator.dart

@@ -12,7 +12,8 @@ class DistanceCalculator {
     final double dLat = _toRadians(lat2 - lat1);
     final double dLon = _toRadians(lon2 - lon1);
 
-    final double a = math.sin(dLat / 2) * math.sin(dLat / 2) +
+    final double a =
+        math.sin(dLat / 2) * math.sin(dLat / 2) +
         math.cos(_toRadians(lat1)) *
             math.cos(_toRadians(lat2)) *
             math.sin(dLon / 2) *
@@ -79,7 +80,7 @@ class DistanceCalculator {
     required double currentLon,
   }) {
     final List<T> sortedItems = List<T>.from(items);
-    
+
     sortedItems.sort((a, b) {
       final distanceA = calculateDistance(
         lat1: currentLat,
@@ -87,24 +88,21 @@ class DistanceCalculator {
         lat2: getLat(a),
         lon2: getLon(a),
       );
-      
+
       final distanceB = calculateDistance(
         lat1: currentLat,
         lon1: currentLon,
         lat2: getLat(b),
         lon2: getLon(b),
       );
-      
+
       return distanceA.compareTo(distanceB);
     });
-    
+
     return sortedItems;
   }
 
   static Map<String, double> getDefaultLocationForKorea() {
-    return {
-      'latitude': 37.5665,
-      'longitude': 126.9780,
-    };
+    return {'latitude': 37.5665, 'longitude': 126.9780};
   }
-}
+}