fix: changed paths area default color to transparent

lib/game/components/path.dart

@@ -10,12 +10,10 @@ class Path extends BodyComponent {
     required List<List<Vector2>> paths,
   })  : _position = position,
         _paths = paths {
-    if (color != null) {
     paint = Paint()
-        ..color = color
+      ..color = color ?? const Color.fromARGB(0, 0, 0, 0)
       ..style = PaintingStyle.stroke;
   }
-  }
 
   factory Path.straight({
     Color? color,

test/game/components/path_test.dart

@@ -1,4 +1,4 @@
-// ignore_for_file: cascade_invocations
+// ignore_for_file: cascade_invocations, prefer_const_constructors
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter/material.dart';
@@ -15,7 +15,7 @@ void main() {
     group('straight', () {
       group('color', () {
         flameTester.test(
-          'has white color by default if not specified',
+          'has transparent color by default if not specified',
           (game) async {
             final path = Path.straight(
               position: Vector2.zero(),
@@ -26,7 +26,10 @@ void main() {
             await game.ensureAdd(path);
             expect(game.contains(path), isTrue);
             expect(path.paint, isNotNull);
-            expect(path.paint.color, equals(Colors.white));
+            expect(
+              path.paint.color,
+              equals(Color.fromARGB(0, 0, 0, 0)),
+            );
           },
         );
         flameTester.test(