fix: beacon menu item consumption, data sync, and button state issues

- Prevent payment item from being consumed when submitting unchanged powers
- Reorder ServerPlayer::openBeacon to send ContainerOpenPacket before
  addSlotListener so beacon data packets arrive after the client menu is ready
- Add BeaconMenu::broadcastChanges() to continuously sync levels and powers
  to clients, matching the pattern FurnaceMenu already uses
- Initialize UIControl_BeaconEffectButton::m_lastState to prevent stale
  heap memory from suppressing Iggy ChangeState calls on menu re-entry

Minecraft.Client/Common/UI/UIControl_BeaconEffectButton.cpp

@@ -9,6 +9,7 @@ UIControl_BeaconEffectButton::UIControl_BeaconEffectButton()
 	m_selected = false;
 	m_active = false;
 	m_focus = false;
+	m_lastState = eState_Disabled;
 }
 
 bool UIControl_BeaconEffectButton::setupControl(UIScene *scene, IggyValuePath *parent, const string &controlName)

Minecraft.Client/PlayerConnection.cpp

@@ -2132,12 +2132,21 @@ void PlayerConnection::handleCustomPayload(shared_ptr<CustomPayloadPacket> custo
 
 				BeaconMenu *beaconMenu = static_cast<BeaconMenu *>(player->containerMenu);
 				Slot *slot = beaconMenu->getSlot(0);
-				if (slot->hasItem())
+				if (slot != nullptr && slot->hasItem())
 				{
-					slot->remove(1);
 					shared_ptr<BeaconTileEntity> beacon = beaconMenu->getBeacon();
+					int prevPrimary = beacon->getPrimaryPower();
+					int prevSecondary = beacon->getSecondaryPower();
+
 					beacon->setPrimaryPower(primary);
 					beacon->setSecondaryPower(secondary);
+
+					// Only consume the payment item if the powers actually changed
+					if (beacon->getPrimaryPower() != prevPrimary || beacon->getSecondaryPower() != prevSecondary)
+					{
+						slot->remove(1);
+					}
+
 					beacon->setChanged();
 				}
 			}

Minecraft.Client/ServerPlayer.cpp

@@ -1431,7 +1431,6 @@ bool ServerPlayer::openBeacon(shared_ptr<BeaconTileEntity> beacon)
 		nextContainerCounter();
 		containerMenu = new BeaconMenu(inventory, beacon);
 		containerMenu->containerId = containerCounter;
-		containerMenu->addSlotListener(this);
 #if defined(_WINDOWS64) && defined(MINECRAFT_SERVER_BUILD)
 		if (FourKitBridge::FireInventoryOpen(entityId, ContainerOpenPacket::BEACON, beacon->getCustomName(), beacon->getContainerSize()))
 		{
@@ -1439,7 +1438,10 @@ bool ServerPlayer::openBeacon(shared_ptr<BeaconTileEntity> beacon)
 			return true;
 		}
 #endif
+		// Send the open packet BEFORE addSlotListener so the client has the
+		// menu ready when the beacon data (levels, powers) arrives.
 		connection->send(std::make_shared<ContainerOpenPacket>(containerCounter, ContainerOpenPacket::BEACON, beacon->getCustomName(), beacon->getContainerSize(), beacon->hasCustomName()));
+		containerMenu->addSlotListener(this);
 		refreshContainer(containerMenu);
 	}
 	else

Minecraft.World/BeaconMenu.cpp

@@ -39,6 +39,29 @@ void BeaconMenu::addSlotListener(ContainerListener *listener)
 	listener->setContainerData(this, 2, secondaryPower);
 }
 
+void BeaconMenu::broadcastChanges()
+{
+	AbstractContainerMenu::broadcastChanges();
+
+	int currentLevels = beacon->getLevels();
+	int currentPrimary = beacon->getPrimaryPower();
+	int currentSecondary = beacon->getSecondaryPower();
+
+	for (auto& listener : containerListeners)
+	{
+		if (levels != currentLevels)
+			listener->setContainerData(this, 0, currentLevels);
+		if (primaryPower != currentPrimary)
+			listener->setContainerData(this, 1, currentPrimary);
+		if (secondaryPower != currentSecondary)
+			listener->setContainerData(this, 2, currentSecondary);
+	}
+
+	levels = currentLevels;
+	primaryPower = currentPrimary;
+	secondaryPower = currentSecondary;
+}
+
 void BeaconMenu::setData(int id, int value)
 {
 	if (id == 0) beacon->setLevels(value);

Minecraft.World/BeaconMenu.h

@@ -36,7 +36,8 @@ private:
 public:
 	BeaconMenu(shared_ptr<Container> inventory, shared_ptr<BeaconTileEntity> beacon);
 
-	void addSlotListener(ContainerListener *listener);
+	void addSlotListener(ContainerListener *listener) override;
+	void broadcastChanges() override;
 	void setData(int id, int value);
 	shared_ptr<BeaconTileEntity> getBeacon();
 	bool stillValid(shared_ptr<Player> player);