fix: brick by brick and model placement work the way the client expects

Mapped from the 1.10.64 client and live captures (docs/BuildWorkflow.md).

Model placement (PropertyManagementComponent):
- A brick built model placed from the inventory spawned at the world origin
  with no rotation and without PlaceModelResponse/PreCreate, and was saved
  to properties_contents with ugc_id 0; it is now placed where the client
  put it, keeps its UGID and blueprint and is saved with them.
- Picking up, putting away and taking apart a brick built model gave it to
  MODELS_IN_BBB and then deleted it; every way off the property now puts it
  in MODELS (carried when picked up), as live, with its blueprint config.
  Taking a premade model apart no longer deletes it either.
- Placing and removing a model saves the property at once, so a crash or a
  disconnect before PropertyEditorEnd does not lose it.
- DoneArrangingWithItem only answers when something new is picked (not when
  leaving), with the subject as build area; SetBuildModeConfirmed's
  warnVisitors matches live.

Brick by brick (BrickByBrick):
- BBBLoadItemRequest moves the model to MODELS_IN_BBB keeping its id and
  fails cleanly when the player has no such model.
- MoveInventoryBatch moves bricks between BRICKS and BRICKS_IN_BBB (it was
  not handled, so the client and server disagreed until a relog).
- BBBSaveRequest uses up the opened models, places the new ones through the
  property, returns the bricks (or uses them with bbb_consume_bricks=1),
  clears the autosave and sends RequeryPropertyModels. Every save makes new
  ugc rows (is_optimized 0, so the UGC server processes them).
- Quick save: SetBBBAutosave is stored per character (bbb_autosave).
- UnUseBBBModel puts a model back on the property where it was when it came
  from there, otherwise back in MODELS.
- Leaving brick mode without a save, a disconnect or a crash: the autosave
  is rebuilt into models (RebuildBBBAutosaveMsg) or the opened models go
  back to MODELS. MODELS_IN_BBB is saved with the character now and loads
  into MODELS, BRICKS_IN_BBB into BRICKS.

Fixes #1632
Fixes #159
Fixes #1565

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dGame/dGameMessages/BuildingMessages.h

@@ -206,6 +206,42 @@ namespace GameMessages {
 		uint32_t timeTakenInMs{};
 	};
 
+	// Client -> server. The player went into (enterFlag) or came out of brick by brick building.
+	// Layout as GameMessage::ActivateBrickMode::Deserialize (0x00d8ecb0) reads it.
+	struct ActivateBrickMode : public NetGameMsg {
+		ActivateBrickMode() : NetGameMsg(MessageType::Game::ACTIVATE_BRICK_MODE) {}
+		void Serialize(RakNet::BitStream& bitStream) const override;
+		bool Deserialize(RakNet::BitStream& bitStream) override;
+		void Handle(Entity& entity, const SystemAddress& sysAddr) override;
+
+		LWOOBJID buildObjectID{ LWOOBJID_EMPTY }; // optional; the property's build area when entering
+		int32_t buildType{ 2 }; // optional; 0 nowhere, 1 in the world, 2 on a property
+		bool enterBuildFromWorld{ true };
+		bool enterFlag{ true };
+	};
+
+	// Client -> server. The client's quick save of the model being built: sd0 compressed LXFML, or just the sd0 header
+	// when there is nothing to keep. Sent every five minutes, when told the player is AFK (msgInformAFK) and before the
+	// client shuts down. Layout as GameMessage::SetBBBAutosave::Deserialize (0x00f2af60) reads it.
+	struct SetBBBAutosave : public NetGameMsg {
+		SetBBBAutosave() : NetGameMsg(MessageType::Game::SET_BBB_AUTOSAVE) {}
+		void Serialize(RakNet::BitStream& bitStream) const override;
+		bool Deserialize(RakNet::BitStream& bitStream) override;
+		void Handle(Entity& entity, const SystemAddress& sysAddr) override;
+
+		std::string lxfmlDataCompressed{}; // u32 byte count, then the bytes
+	};
+
+	// Server -> client. How many unfinished (autosaved) models the server rebuilt into models; the client shows
+	// BBB_AUTOSAVE_REBUILDING_SINGLE or _MULTIPLE (LWOBBBComponent_Client::msgRebuildBBBAutosaveMsg, 0x00cfabd0).
+	struct RebuildBBBAutosaveMsg : public NetGameMsg {
+		RebuildBBBAutosaveMsg() : NetGameMsg(MessageType::Game::REBUILD_BBB_AUTOSAVE_MSG) {}
+		void Serialize(RakNet::BitStream& bitStream) const override;
+		bool Deserialize(RakNet::BitStream& bitStream) override;
+
+		int32_t count{};
+	};
+
 	struct SetModelToBuild : public NetGameMsg {
 		SetModelToBuild() : NetGameMsg(MessageType::Game::SET_MODEL_TO_BUILD) {}
 		void Serialize(RakNet::BitStream& bitStream) const override;