Uplink store interface searchable with a searchbar. (#24287)

* Can now search the uplink store interface with a searchbar.

* Search text updates no longer send server messages. Persists listings locally.

* Formatting fixes and tidying.

* Added helper method to get localised name and description (or otherwise, entity name and description) of store listing items.

* Update Content.Client/Store/Ui/StoreMenu.xaml

* Review change; moved localisation helper functions to their own class.

* Prevent thread-unsafe behaviour as-per review.

* Remove dummy boxcontainer

---------

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Shared/Store/ListingLocalisationHelpers.cs

@@ -0,0 +1,42 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Store;
+
+public static class ListingLocalisationHelpers
+{
+    /// <summary>
+    /// ListingData's Name field can be either a localisation string or the actual entity's name.
+    /// This function gets a localised name from the localisation string if it exists, and if not, it gets the entity's name.
+    /// If neither a localised string exists, or an associated entity name, it will return the value of the "Name" field.
+    /// </summary>
+    public static string GetLocalisedNameOrEntityName(ListingData listingData, IPrototypeManager prototypeManager)
+    {
+        bool wasLocalised = Loc.TryGetString(listingData.Name, out string? listingName);
+
+        if (!wasLocalised && listingData.ProductEntity != null)
+        {
+            var proto = prototypeManager.Index<EntityPrototype>(listingData.ProductEntity);
+            listingName = proto.Name;
+        }
+
+        return listingName ?? listingData.Name;
+    }
+
+    /// <summary>
+    /// ListingData's Description field can be either a localisation string or the actual entity's description.
+    /// This function gets a localised description from the localisation string if it exists, and if not, it gets the entity's description.
+    /// If neither a localised string exists, or an associated entity description, it will return the value of the "Description" field.
+    /// </summary>
+    public static string GetLocalisedDescriptionOrEntityDescription(ListingData listingData, IPrototypeManager prototypeManager)
+    {
+        bool wasLocalised = Loc.TryGetString(listingData.Description, out string? listingDesc);
+
+        if (!wasLocalised && listingData.ProductEntity != null)
+        {
+            var proto = prototypeManager.Index<EntityPrototype>(listingData.ProductEntity);
+            listingDesc = proto.Description;
+        }
+
+        return listingDesc ?? listingData.Description;
+    }
+}