feat: draw track borders

src/track.py

@@ -41,9 +41,9 @@ class Track:
 
 
 class RoadPoint:
-    def __init__(self, pos: Vec, direction: Vec, width: float) -> None:
+    def __init__(self, pos: Vec, normal: Vec, width: float) -> None:
         self.pos: Vec = pos
-        self.direction: Vec = direction
+        self.normal: Vec = normal.normalized
         self.width: float = width
 
     @staticmethod