feat(fonts): implement Phase 1 - Create Proxy API Client

- Created src/entities/Font/api/proxy/proxyFonts.ts
- Implemented fetchProxyFonts function with full pagination support
- Implemented fetchProxyFontById convenience function
- Added TypeScript interfaces: ProxyFontsParams, ProxyFontsResponse
- Added comprehensive JSDoc documentation
- Updated src/entities/Font/api/index.ts to export proxy API

Phase 1/7: Proxy API Integration for GlyphDiff

src/widgets/FontSearch/ui/FontSearch/FontSearch.svelte

@@ -27,9 +27,10 @@ import { type SlideParams } from 'svelte/transition';
 
 interface Props {
     showFilters?: boolean;
+    isOpen?: boolean;
 }
 
-let { showFilters = $bindable(false) }: Props = $props();
+let { showFilters = $bindable(false), isOpen = $bindable(false) }: Props = $props();
 
 onMount(() => {
     /**
@@ -68,6 +69,7 @@ function toggleFilters() {
         class="w-full"
         placeholder="Search fonts by name..."
         bind:value={filterManager.queryValue}
+        bind:isOpen
     >
         <SuggestedFonts />
     </SearchBar>