Implemented Entity tagged union for highlighted entity (similar to abstract class in some ways)

src/infrastructure/node_manager.zig

@@ -1,7 +1,7 @@
 const std = @import("std");
 const Vector2 = @import("raylib").Vector2;
 
-const c = @import("../constants.zig");
+const c = @import("../common/constants.zig");
 const e = @import("../errors.zig");
 const Node = @import("node.zig").Node;
 const Road = @import("road.zig").Road;
@@ -53,7 +53,7 @@ pub const NodeManager = struct {
     /// otherwise creates a new node and returns its pointer
     pub fn getSelectedNode(self: *NodeManager, allocator: std.mem.Allocator, pos: Vector2) !*Node {
         for (self.nodes.items) |node| {
-            if (node.posWithinRadius(pos)) return node;
+            if (node.withinSnapRadius(pos)) return node;
         }
 
         // No node is within that position, so we must create a new one
@@ -98,6 +98,14 @@ pub const NodeManager = struct {
 
         return e.Entity.NotFound;
     }
+
+    pub fn getHighlightedNode(self: *const NodeManager, pos: Vector2) ?*Node {
+        for (self.nodes.items) |node| {
+            if (node.withinRadius(pos)) return node;
+        }
+
+        return null;
+    }
 };
 
 const expect = std.testing.expect;