Add cachedItems to kits; prevent kit item drops

Introduce an abstract cachedItems property on Kit (ConcurrentHashMap<UUID, List<ItemStack>>) to track per-player kit items. Update implementations (BackupKit, GoblinKit, IceMageKit, TemplateKit) to override and initialize cachedItems. GameStateListener now checks dropped items against the selected kit cache and cancels drops (playing a sound) for kit items, and adds handlers to cancel item pickup/despawn outside active game states. Add necessary imports for ItemStack, UUID, ConcurrentHashMap and new event types.

src/main/kotlin/club/mcscrims/speedhg/kit/Kit.kt

@@ -5,6 +5,9 @@ import club.mcscrims.speedhg.kit.ability.PassiveAbility
 import net.kyori.adventure.text.Component
 import org.bukkit.Material
 import org.bukkit.entity.Player
+import org.bukkit.inventory.ItemStack
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
 
 /**
  * Base class for every kit in SpeedHG.
@@ -61,6 +64,8 @@ abstract class Kit {
 	//  Item distribution
 	// -------------------------------------------------------------------------
 
+	abstract val cachedItems: ConcurrentHashMap<UUID, List<ItemStack>>
+
 	/**
 	 * Give the player their kit-specific items at game start (after teleportation).
 	 * The standard HG items (soup, compass, etc.) are already given by [GameManager].

src/main/kotlin/club/mcscrims/speedhg/kit/impl/BackupKit.kt

@@ -9,6 +9,9 @@ import club.mcscrims.speedhg.kit.ability.PassiveAbility
 import net.kyori.adventure.text.Component
 import org.bukkit.Material
 import org.bukkit.entity.Player
+import org.bukkit.inventory.ItemStack
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
 
 class BackupKit : Kit() {
 
@@ -52,6 +55,8 @@ class BackupKit : Kit() {
 
 	// ── Item distribution ─────────────────────────────────────────────────────
 
+	override val cachedItems = ConcurrentHashMap<UUID, List<ItemStack>>()
+
 	override fun giveItems( player: Player, playstyle: Playstyle ) {}
 
 	private class NoActive( playstyle: Playstyle ) : ActiveAbility( playstyle ) {

src/main/kotlin/club/mcscrims/speedhg/kit/impl/GoblinKit.kt

@@ -61,7 +61,7 @@ class GoblinKit : Kit() {
 
 	// ── Item distribution ─────────────────────────────────────────────────────
 
-	private val cachedItems = ConcurrentHashMap<UUID, List<ItemStack>>()
+	override val cachedItems = ConcurrentHashMap<UUID, List<ItemStack>>()
 
 	override fun giveItems(
 		player: Player,

src/main/kotlin/club/mcscrims/speedhg/kit/impl/IceMageKit.kt

@@ -62,7 +62,7 @@ class IceMageKit : Kit() {
 
 	// ── Item distribution ─────────────────────────────────────────────────────
 
-	private val cachedItems = ConcurrentHashMap<UUID, List<ItemStack>>()
+	override val cachedItems = ConcurrentHashMap<UUID, List<ItemStack>>()
 
 	override fun giveItems(
 		player: Player,

src/main/kotlin/club/mcscrims/speedhg/kit/impl/TemplateKit.kt

@@ -14,6 +14,8 @@ import org.bukkit.event.entity.EntityDamageByEntityEvent
 import org.bukkit.inventory.ItemStack
 import org.bukkit.potion.PotionEffect
 import org.bukkit.potion.PotionEffectType
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
 
 /**
  * ──────────────────────────────────────────────────────────────────────────────
@@ -60,6 +62,8 @@ class TemplateKit : Kit() {
 
 	// ── Item distribution ─────────────────────────────────────────────────────
 
+	override val cachedItems = ConcurrentHashMap<UUID, List<ItemStack>>()
+
 	override fun giveItems(player: Player, playstyle: Playstyle) {
 		// Slot 8 = ability trigger item (always present)
 		player.inventory.setItem(8, ItemStack(Material.BLAZE_ROD))

src/main/kotlin/club/mcscrims/speedhg/listener/GameStateListener.kt

@@ -16,7 +16,9 @@ import org.bukkit.event.block.LeavesDecayEvent
 import org.bukkit.event.enchantment.EnchantItemEvent
 import org.bukkit.event.entity.EntityDamageByEntityEvent
 import org.bukkit.event.entity.FoodLevelChangeEvent
+import org.bukkit.event.entity.ItemDespawnEvent
 import org.bukkit.event.inventory.*
+import org.bukkit.event.player.PlayerAttemptPickupItemEvent
 import org.bukkit.event.player.PlayerDropItemEvent
 import org.bukkit.event.player.PlayerItemDamageEvent
 import org.bukkit.event.player.PlayerJoinEvent
@@ -169,7 +171,35 @@ class GameStateListener : Listener {
 			return
 		}
 
-		// TODO: add kit item check
+		val kitItems = plugin.kitManager.getSelectedKit( player )?.cachedItems?.get( player.uniqueId ) ?: return
+		val item = event.itemDrop.itemStack
+
+		if (kitItems.contains( item ))
+		{
+			event.isCancelled = true
+			player.playSound( player.location, Sound.BLOCK_NOTE_BLOCK_BASS, 1f, 1f )
+		}
+	}
+
+	@EventHandler
+	fun onPickupItem(
+		event: PlayerAttemptPickupItemEvent
+	) {
+		val player = event.player
+
+		if ( gameManager.currentState == GameState.INVINCIBILITY ||
+			 gameManager.currentState == GameState.INGAME )
+			return
+
+		event.isCancelled = true
+		player.playSound( player.location, Sound.BLOCK_NOTE_BLOCK_BASS, 1f, 1f )
+	}
+
+	@EventHandler
+	fun onItemDespawn(
+		event: ItemDespawnEvent
+	) {
+		event.isCancelled = true
 	}
 
 	private val swordNerf = 0.5