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/utils/index.ts

@@ -11,6 +11,7 @@ export * from './LocalizeFormattedNumber';
 export * from './LocalizeShortNumber';
 export * from './LocalizeText';
 export * from './PlaySound';
+export * from './PrefixUtils';
 export * from './ProductImageUtility';
 export * from './Randomizer';
 export * from './RoomChatFormatter';