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)