feat: Add lootbox item type with weighted rewards and dedicated UI for item usage results.

src/modules/inventory/effects/registry.ts

@@ -4,7 +4,8 @@ import {
     handleReplyMessage,
     handleXpBoost,
     handleTempRole,
-    handleColorRole
+    handleColorRole,
+    handleLootbox
 } from "./handlers";
 import type { EffectHandler } from "./types";
 
@@ -14,5 +15,6 @@ export const effectHandlers: Record<string, EffectHandler> = {
     'REPLY_MESSAGE': handleReplyMessage,
     'XP_BOOST': handleXpBoost,
     'TEMP_ROLE': handleTempRole,
-    'COLOR_ROLE': handleColorRole
+    'COLOR_ROLE': handleColorRole,
+    'LOOTBOX': handleLootbox
 };