feat(normalize): use type FontVariant instead of string

src/entities/Font/model/types/normalize.ts

@@ -8,17 +8,18 @@ import type {
     FontCategory,
     FontProvider,
     FontSubset,
+    FontVariant,
 } from './common';
 
 /**
  * Font variant types (standardized)
  */
-export type UnifiedFontVariant = string;
+export type UnifiedFontVariant = FontVariant;
 
 /**
  * Font style URLs
  */
-export interface FontStyleUrls {
+export interface LegacyFontStyleUrls {
     /** Regular weight URL */
     regular?: string;
     /** Italic URL */
@@ -29,6 +30,10 @@ export interface FontStyleUrls {
     boldItalic?: string;
 }
 
+export interface FontStyleUrls extends LegacyFontStyleUrls {
+    variants?: Partial<Record<UnifiedFontVariant, string>>;
+}
+
 /**
  * Font metadata
  */