Revert "feat(B.5): pickup feedback chat line + toast ("You pick up the X.")"

This reverts commit 87ba5c9a98.

src/AcDream.App/Rendering/GameWindow.cs

@@ -1921,17 +1921,6 @@ public sealed class GameWindow : IDisposable
             _liveSession.PlayerKilledReceived += pk =>
                 Chat.OnPlayerKilled(pk.DeathMessage, pk.VictimGuid, pk.KillerGuid);
 
-            // B.5 polish (2026-05-14): surface successful pickups as a
-            // retail-style "You pick up the X." system chat line plus a
-            // toast. PickupEvent fires BEFORE the EntityDeleted despawn
-            // chain so the entity-name lookup still hits.
-            _liveSession.EntityPickedUp += parsed =>
-            {
-                string name = DescribeLiveEntity(parsed.Guid);
-                Chat.OnSystemMessage($"You pick up the {name}.", chatType: 0);
-                _debugVm?.AddToast($"Picked up: {name}");
-            };
-
             _liveSession.TurbineChatReceived += parsed =>
             {
                 if (parsed.Body is AcDream.Core.Net.Messages.TurbineChat.Payload.EventSendToRoom ev)

src/AcDream.Core.Net/WorldSession.cs

@@ -84,17 +84,6 @@ public sealed class WorldSession : IDisposable
     /// </summary>
     public event Action<DeleteObject.Parsed>? EntityDeleted;
 
-    /// <summary>
-    /// Fires when the session parses a 0xF74A PickupEvent game message —
-    /// distinguishes a despawn caused by a player pickup from a generic
-    /// <c>DeleteObject</c> despawn. Fires BEFORE <see cref="EntityDeleted"/>
-    /// for the same guid so subscribers can read entity state (e.g. name)
-    /// before the despawn handler removes the entity. Useful for "You pick
-    /// up the <i>X</i>" chat/toast feedback that needs the entity's display
-    /// name at the moment of pickup.
-    /// </summary>
-    public event Action<PickupEvent.Parsed>? EntityPickedUp;
-
     /// <summary>
     /// Payload for <see cref="MotionUpdated"/>: the server guid of the entity
     /// whose motion changed and its new server-side stance + forward command.
@@ -728,22 +717,14 @@ public sealed class WorldSession : IDisposable
                 // ACE sends PickupEvent (0xF74A) instead of DeleteObject
                 // when a player picks up a world item (Player_Tracking
                 // .RemoveTrackedObject with fromPickup=true). Downstream
-                // view-removal semantics are identical to DeleteObject, so
+                // view-removal semantics are identical, so we adapt to
-                // we adapt to DeleteObject.Parsed and reuse the existing
+                // DeleteObject.Parsed and reuse the existing handler.
-                // EntityDeleted handler. We also fire a distinct
-                // EntityPickedUp event BEFORE the despawn so a subscriber
-                // can read entity-side state (e.g. its display name) for
-                // pickup-feedback chat / toast lines while the entity is
-                // still resident.
                 var parsed = PickupEvent.TryParse(body);
                 if (parsed is not null)
-                {
-                    EntityPickedUp?.Invoke(parsed.Value);
                     EntityDeleted?.Invoke(
                         new DeleteObject.Parsed(
                             parsed.Value.Guid, parsed.Value.InstanceSequence));
             }
-            }
             else if (op == UpdateMotion.Opcode)
             {
                 // Phase 6.6: the server sends UpdateMotion (0xF74C) whenever an