fix(inventory): await final wield confirmation

Keep the retail inventory transaction busy until authoritative WieldObject confirms the requested weapon. This prevents rapid weapon changes from overlapping on ACE and rejecting otherwise valid items such as spears.

Co-Authored-By: Codex <codex@openai.com>

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

@@ -485,12 +485,54 @@ public sealed class ItemInteractionControllerTests
 
         Assert.True(h.Controller.ActivateItem(bow));
         h.Now += 200;
-        Assert.True(h.Controller.ActivateItem(bow));
+        Assert.False(h.Controller.ActivateItem(bow));
 
         Assert.Single(h.Puts);
         Assert.Empty(h.Wields);
     }
 
+    [Fact]
+    public void WeaponReplacement_doesNotOverlapWhileAwaitingFinalWieldConfirmation()
+    {
+        var h = new Harness();
+        const uint sword = 0x50000B15u;
+        const uint bow = 0x50000B16u;
+        h.Objects.AddOrUpdate(new ClientObject
+        {
+            ObjectId = sword,
+            Type = ItemType.MeleeWeapon,
+            CombatUse = 1,
+            ValidLocations = EquipMask.MeleeWeapon,
+        });
+        h.Objects.MoveItem(sword, Player, -1, EquipMask.MeleeWeapon);
+        h.AddContained(bow, item =>
+        {
+            item.Type = ItemType.MissileWeapon;
+            item.CombatUse = 2;
+            item.ValidLocations = EquipMask.MissileWeapon;
+        });
+
+        Assert.True(h.Controller.ActivateItem(bow));
+        h.Objects.MoveItem(sword, Player, 0, EquipMask.None);
+        Assert.Single(h.Wields);
+
+        // Bow is optimistic but ACE has not sent WieldObject yet. Retail's
+        // waiting state consumes this attempted reverse switch.
+        h.Now += 200;
+        Assert.False(h.Controller.ActivateItem(sword));
+        Assert.Single(h.Puts);
+        Assert.Single(h.Wields);
+
+        // Authoritative WieldObject + ConfirmMove completes the transaction.
+        h.Objects.MoveItem(bow, Player, -1, EquipMask.MissileWeapon);
+        h.Objects.ConfirmMove(bow);
+        h.Now += 200;
+        Assert.True(h.Controller.ActivateItem(sword));
+        Assert.Equal(
+            new[] { (sword, Player, 0), (bow, Player, 0) },
+            h.Puts);
+    }
+
     [Fact]
     public void WeaponReplacement_serverReject_clearsPendingTransactionForRetry()
     {