fix(interaction): publish pending keyboard pickups

Route F-key pickup through the same ItemHolder backpack placement entry point as double-click activation so the inventory reserves the destination slot before the request is sent.

tests/AcDream.App.Tests/UI/ItemInteractionControllerTests.cs

@@ -1419,6 +1419,21 @@ public sealed class ItemInteractionControllerTests
         Assert.Equal(2, h.Uses.Count);
     }
 
+    [Fact]
+    public void KeyboardPickup_PublishesPendingDestinationBeforeRequest()
+    {
+        var h = new Harness();
+        const uint item = 0x70000A0Bu;
+        var pending = new List<(uint Item, uint Container, int Placement)>();
+        h.Controller.PendingBackpackPlacementRequested +=
+            (objectId, container, placement) => pending.Add((objectId, container, placement));
+
+        Assert.True(h.Controller.PlaceWorldItemInBackpack(item));
+
+        Assert.Equal(new[] { (item, Player, 0) }, pending);
+        Assert.Equal(new[] { (item, Player, 0) }, h.BackpackPlacements);
+    }
+
     [Fact]
     public void ResetSession_ClearsTargetBusyThrottleAndConsumedClickState()
     {