feat(fonts): implement Phase 4 - Update UI Components

- Replaced fontshareStore with unifiedFontStore in FontSearch.svelte
- Replaced fontshareStore with unifiedFontStore in SuggestedFonts.svelte
- Updated Font entity exports to include unifiedFontStore
- Updated model exports to include unified store exports
- Kept fontshareStore exports as deprecated for backward compatibility

Phase 4/7: Proxy API Integration for GlyphDiff

src/entities/Font/index.ts

@@ -1,3 +1,14 @@
+// Proxy API (PRIMARY)
+export {
+    fetchProxyFontById,
+    fetchProxyFonts,
+} from './api/proxy/proxyFonts';
+export type {
+    ProxyFontsParams,
+    ProxyFontsResponse,
+} from './api/proxy/proxyFonts';
+
+// Fontshare API (DEPRECATED)
 export {
     fetchAllFontshareFonts,
     fetchFontshareFontBySlug,
@@ -7,6 +18,8 @@ export type {
     FontshareParams,
     FontshareResponse,
 } from './api/fontshare/fontshare';
+
+// Google Fonts API (DEPRECATED)
 export {
     fetchGoogleFontFamily,
     fetchGoogleFonts,
@@ -61,13 +74,17 @@ export type {
 
 export {
     appliedFontsManager,
-    createFontshareStore,
+    createUnifiedFontStore,
     fetchFontshareFontsQuery,
-    fontshareStore,
     selectedFontsStore,
+    unifiedFontStore,
 } from './model';
 
-// Stores
+// Stores (DEPRECATED)
+export {
+    createFontshareStore,
+    fontshareStore,
+} from './model';
 export {
     createGoogleFontsStore,
     GoogleFontsStore,