Make wielding automatically drop the item on your other hand (#27975)

* Make wielding automatically drop the item on your other hand

* Fix docs

* Remove redundant parameter

* Fix not deleting virtuals on fail

* Make count freeable hands method

* Add popup when dropping item

Content.Shared/Hands/Components/HandHelpers.cs

@@ -1,4 +1,5 @@
 using System.Linq;
+using Content.Shared.Hands.EntitySystems;
 
 namespace Content.Shared.Hands.Components;
 
@@ -20,6 +21,15 @@ public static class HandHelpers
     /// </summary>
     public static int CountFreeHands(this HandsComponent component) => component.Hands.Values.Count(hand => hand.IsEmpty);
 
+    /// <summary>
+    ///     Get the number of hands that are not currently holding anything. This is a LinQ method, not a property, so
+    ///     cache it instead of accessing this multiple times.
+    /// </summary>
+    public static int CountFreeableHands(this Entity<HandsComponent> component, SharedHandsSystem system)
+    {
+        return system.CountFreeableHands(component);
+    }
+
     /// <summary>
     ///     Get a list of hands that are currently holding nothing. This is a LinQ method, not a property, so cache
     ///     it instead of accessing this multiple times.