Accent trait limit (#28046)

Content.Client/Lobby/UI/Roles/TraitPreferenceSelector.xaml.cs

@@ -9,6 +9,8 @@ namespace Content.Client.Lobby.UI.Roles;
 [GenerateTypedNameReferences]
 public sealed partial class TraitPreferenceSelector : Control
 {
+    public int Cost;
+
     public bool Preference
     {
         get => Checkbox.Pressed;
@@ -20,7 +22,12 @@ public sealed partial class TraitPreferenceSelector : Control
     public TraitPreferenceSelector(TraitPrototype trait)
     {
         RobustXamlLoader.Load(this);
-        Checkbox.Text = Loc.GetString(trait.Name);
+
+        var text = trait.Cost != 0 ? $"[{trait.Cost}] " : "";
+        text += Loc.GetString(trait.Name);
+
+        Cost = trait.Cost;
+        Checkbox.Text = text;
         Checkbox.OnToggled += OnCheckBoxToggled;
 
         if (trait.Description is { } desc)