test(Font): make queryClient mock factory self-contained

The vi.mock factory referenced the top-level QueryClient import. Once
BaseQueryStore landed in the $shared/lib barrel, importing that barrel
for createFilter eagerly pulled @tanstack/query-core into the init
cycle, so the hoisted factory hit the import before initialization
(Cannot access '__vi_import_2__' before initialization). Import
QueryClient inside the factory to keep it independent of module order.

src/entities/Font/model/store/fontCatalogStore/fontCatalogStore.svelte.spec.ts

@@ -2,7 +2,6 @@ import {
     generateMixedCategoryFonts,
     generateMockFonts,
 } from '$entities/Font/testing';
-import { QueryClient } from '@tanstack/query-core';
 import { flushSync } from 'svelte';
 import {
     afterEach,
@@ -20,6 +19,13 @@ import type { UnifiedFont } from '../../types';
 import { FontCatalogStore } from './fontCatalogStore.svelte';
 
 vi.mock('$shared/api/queryClient', async importOriginal => {
+    /**
+     * Import QueryClient inside the factory rather than referencing the top-level binding.
+     * A hoisted vi.mock factory that touches a module-level import can hit that import
+     * before it is initialized (ReferenceError) when the import sits in a circular/eager
+     * barrel chain — which it now does via $shared/lib → BaseQueryStore → query-core.
+     */
+    const { QueryClient } = await import('@tanstack/query-core');
     const actual = await importOriginal<typeof import('$shared/api/queryClient')>();
     return {
         ...actual,