feat(UnifiedFontStore): throw FontNetworkError and FontResponseError in fetchFn

src/entities/Font/model/store/unifiedFontStore/unifiedFontStore.svelte.ts

@@ -15,6 +15,10 @@
 import type { QueryObserverOptions } from '@tanstack/query-core';
 import type { ProxyFontsParams } from '../../../api';
 import { fetchProxyFonts } from '../../../api';
+import {
+    FontNetworkError,
+    FontResponseError,
+} from '../../../lib/errors/errors';
 import type { UnifiedFont } from '../../types';
 import { BaseFontStore } from '../baseFontStore/baseFontStore.svelte';
 
@@ -188,36 +192,29 @@ export class UnifiedFontStore extends BaseFontStore<ProxyFontsParams> {
      * Returns the full response including pagination metadata
      */
     protected async fetchFn(params: ProxyFontsParams): Promise<UnifiedFont[]> {
-        const response = await fetchProxyFonts(params);
+        let response: Awaited<ReturnType<typeof fetchProxyFonts>>;
+        try {
+            response = await fetchProxyFonts(params);
+        } catch (cause) {
+            throw new FontNetworkError(cause);
+        }
 
-        // Validate response structure
         if (!response) {
-            console.error('[UnifiedFontStore] fetchProxyFonts returned undefined', { params });
+            throw new FontResponseError('response', response);
-            throw new Error('Proxy API returned undefined response');
         }
-
         if (!response.fonts) {
-            console.error('[UnifiedFontStore] response.fonts is undefined', { response });
+            throw new FontResponseError('response.fonts', response.fonts);
-            throw new Error('Proxy API response missing fonts array');
         }
-
         if (!Array.isArray(response.fonts)) {
-            console.error('[UnifiedFontStore] response.fonts is not an array', {
+            throw new FontResponseError('response.fonts', response.fonts);
-                fonts: response.fonts,
-            });
-            throw new Error('Proxy API fonts is not an array');
         }
 
-        // Store pagination metadata separately for derived values
         this.#paginationMetadata = {
             total: response.total ?? 0,
             limit: response.limit ?? this.params.limit ?? 50,
             offset: response.offset ?? this.params.offset ?? 0,
         };
 
-        // Accumulate fonts for infinite scroll
-        // Note: For offset === 0, we rely on the $effect above to handle the reset/init
-        // This prevents race conditions and double-setting.
         if (params.offset !== 0) {
             this.#accumulatedFonts = [...this.#accumulatedFonts, ...response.fonts];
         }