fix(interaction): restore retail loot placement and world-drop projection

src/AcDream.App/UI/WorldDropDispatch.cs

@@ -0,0 +1,11 @@
+using AcDream.Core.Items;
+
+namespace AcDream.App.UI;
+
+/// <summary>
+/// One successfully dispatched inventory-to-world request together with the
+/// quantity selected by the retained UI.
+/// </summary>
+public readonly record struct WorldDropDispatch(
+    PendingInventoryRequest Request,
+    uint Amount);