Enable verbs for items in storage and prevent orphaned nested UIs (#5512)

Content.Client/Interactable/InteractionSystem.cs

@@ -1,9 +1,25 @@
+using Content.Client.Storage;
 using Content.Shared.Interaction;
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
 
 namespace Content.Client.Interactable
 {
     public sealed class InteractionSystem : SharedInteractionSystem
     {
+        public override bool CanAccessViaStorage(EntityUid user, EntityUid target)
+        {
+            if (!EntityManager.TryGetEntity(target, out var entity))
+                return false;
 
+            if (!entity.TryGetContainer(out var container))
+                return false;
+
+            if (!EntityManager.TryGetComponent(container.Owner.Uid, out ClientStorageComponent storage))
+                return false;
+
+            // we don't check if the user can access the storage entity itself. This should be handed by the UI system.
+            return storage.UIOpen;
+        }
     }
 }