NPC steering tweaks (#26351)

- Fix the free node check considering the whole tile and not the poly.
- Clear maps on direction resets.
- More robust arrival checks for pathfinding nodes.

Content.Server/NPC/Systems/NPCSteeringSystem.cs

@@ -274,6 +274,8 @@ public sealed partial class NPCSteeringSystem : SharedNPCSteeringSystem
         if (clear && value.Equals(Vector2.Zero))
         {
             steering.CurrentPath.Clear();
+            Array.Clear(steering.Interest);
+            Array.Clear(steering.Danger);
         }
 
         component.CurTickSprintMovement = value;