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/hooks/rooms/widgets/index.ts

@@ -1,5 +1,6 @@
 export * from './furniture';
 export * from './useAvatarInfoWidget';
+export * from './useChatCommandSelector';
 export * from './useChatInputWidget';
 export * from './useChatWidget';
 export * from './useDoorbellWidget';

src/hooks/rooms/widgets/useChatWidget.ts

@@ -149,6 +149,11 @@ const useChatWidgetState = () =>
             imageUrl,
             color);
 
+        chatMessage.prefixText = event.prefixText || '';
+        chatMessage.prefixColor = event.prefixColor || '';
+        chatMessage.prefixIcon = event.prefixIcon || '';
+        chatMessage.prefixEffect = event.prefixEffect || '';
+
         setChatMessages(prevValue =>
         {
             const newValue = [ ...prevValue, chatMessage ];