feat: custom prefix system with effects, emoji picker and per-letter colors

- Catalog page for creating custom prefixes with text, per-letter colors, emoji icon and visual effects
- Emoji picker via @emoji-mart/react with createPortal + Shadow DOM blur fix
- Inventory prefix management (activate/deactivate/delete)
- Chat bubble rendering with multi-color prefix and effect support
- Prefix utilities (getPrefixEffectStyle, parsePrefixColors, PREFIX_EFFECT_KEYFRAMES)
- All UI text in English

src/api/room/widgets/ChatBubbleMessage.ts

@@ -7,6 +7,10 @@ export class ChatBubbleMessage
     public height: number = 0;
     public elementRef: HTMLDivElement = null;
     public skipMovement: boolean = false;
+    public prefixText: string = '';
+    public prefixColor: string = '';
+    public prefixIcon: string = '';
+    public prefixEffect: string = '';
 
     private _top: number = 0;
     private _left: number = 0;

src/api/room/widgets/index.ts

@@ -7,6 +7,7 @@ export * from './AvatarInfoUser';
 export * from './AvatarInfoUtilities';
 export * from './BotSkillsEnum';
 export * from './ChatBubbleMessage';
+export * from './CommandDefinition';
 export * from './ChatBubbleUtilities';
 export * from './ChatMessageTypeEnum';
 export * from './DimmerFurnitureWidgetPresetItem';