refactor(font): expose stores via model segment, not the top barrel

Re-exporting the store singletons (fontCatalogStore, fontLifecycleManager,
FontsByIdsStore) through entities/Font/index.ts meant every consumer of the
barrel eager-instantiated stores and pulled @tanstack/query-core — in dev,
test, and as retained code. Drop the store re-export from the top barrel;
keep the pure surface (types, constants, domain, lib, ui) there for
convenience. Consumers that need stores import $entities/Font/model.
Aligns with the BaseQueryStore carve-out: barrel by default, segment path
when it would drag a heavy or side-effectful dependency.

src/entities/Font/index.ts

@@ -1,8 +1,21 @@
 export * from './api';
 export * from './domain';
 export * from './lib';
-export * from './model';
 export * from './ui';
 
+// Pure model surface (types + constants) is part of the convenient top-level
+// API. Stateful stores are deliberately excluded — see below.
+export * from './model/const/const';
+export * from './model/types';
+
+/*
+ * Stores (`fontCatalogStore`, `fontLifecycleManager`, `FontsByIdsStore`) are
+ * intentionally NOT re-exported here. They instantiate module-level singletons
+ * and pull `@tanstack/query-core`, so funneling them through this barrel would
+ * make every consumer of `$entities/Font` eager-instantiate stores (and break
+ * tree-shaking / test init-order). Import them via the model segment:
+ *   import { fontCatalogStore } from '$entities/Font/model';
+ */
+
 // `./testing` is intentionally not re-exported: fixtures must not leak into the
 // production public API. Import them via `$entities/Font/testing`.

src/features/FilterAndSortFonts/model/store/bindings.svelte.ts

@@ -9,7 +9,7 @@
  * observer, so it lives at module scope, not in any individual widget.
  */
 
-import { fontCatalogStore } from '$entities/Font';
+import { fontCatalogStore } from '$entities/Font/model';
 import { untrack } from 'svelte';
 import { mapAppliedFiltersToParams } from '../../lib/mapper/mapAppliedFiltersToParams';
 import { appliedFilterStore } from './appliedFilterStore/appliedFilterStore.svelte';

src/widgets/ComparisonView/model/stores/comparisonStore.svelte.ts

@@ -15,12 +15,14 @@
 
 import {
     type FontLoadRequestConfig,
-    FontsByIdsStore,
     type UnifiedFont,
-    fontCatalogStore,
-    fontLifecycleManager,
     getFontUrl,
 } from '$entities/Font';
+import {
+    FontsByIdsStore,
+    fontCatalogStore,
+    fontLifecycleManager,
+} from '$entities/Font/model';
 import { typographySettingsStore } from '$features/AdjustTypography/model';
 import { createPersistentStore } from '$shared/lib';
 import { untrack } from 'svelte';

src/widgets/ComparisonView/model/stores/comparisonStore.test.ts

@@ -53,6 +53,16 @@ vi.mock('$shared/lib/helpers/createPersistentStore/createPersistentStore.svelte'
 
 vi.mock('$entities/Font', async importOriginal => {
     const actual = await importOriginal<typeof import('$entities/Font')>();
+    return {
+        ...actual,
+        getFontUrl: vi.fn(() => 'https://example.com/font.woff2'),
+    };
+});
+
+// Stores moved behind the model segment; mock them there. FontsByIdsStore is
+// intentionally left real (spread from actual) so $state reactivity works.
+vi.mock('$entities/Font/model', async importOriginal => {
+    const actual = await importOriginal<typeof import('$entities/Font/model')>();
     return {
         ...actual,
         fontCatalogStore: { fonts: [] },
@@ -63,7 +73,6 @@ vi.mock('$entities/Font', async importOriginal => {
             getFontStatus: vi.fn(),
             ready: vi.fn(() => Promise.resolve()),
         },
-        getFontUrl: vi.fn(() => 'https://example.com/font.woff2'),
     };
 });
 
@@ -84,11 +93,11 @@ vi.mock('$features/AdjustTypography/model', () => ({
     },
 }));
 
+import * as proxyFonts from '$entities/Font/api/proxy/proxyFonts';
 import {
     fontCatalogStore,
     fontLifecycleManager,
-} from '$entities/Font';
-import * as proxyFonts from '$entities/Font/api/proxy/proxyFonts';
+} from '$entities/Font/model';
 import { ComparisonStore } from './comparisonStore.svelte';
 
 describe('ComparisonStore', () => {

src/widgets/ComparisonView/ui/FontList/FontList.svelte

@@ -9,9 +9,11 @@ import {
     FontVirtualList,
     type UnifiedFont,
     VIRTUAL_INDEX_NOT_LOADED,
+} from '$entities/Font';
+import {
     fontCatalogStore,
     fontLifecycleManager,
-} from '$entities/Font';
+} from '$entities/Font/model';
 import { getSkeletonWidth } from '$shared/lib/utils';
 import {
     Button,

src/widgets/SampleList/ui/SampleList/SampleList.svelte

@@ -8,9 +8,11 @@
 import {
     FontVirtualList,
     createFontRowSizeResolver,
+} from '$entities/Font';
+import {
     fontCatalogStore,
     fontLifecycleManager,
-} from '$entities/Font';
+} from '$entities/Font/model';
 import {
     TypographyMenu,
     typographySettingsStore,

src/widgets/SampleList/ui/SampleListSection/SampleListSection.svelte

@@ -3,7 +3,7 @@
     Wraps SampleList with a Section component
 -->
 <script lang="ts">
-import { fontCatalogStore } from '$entities/Font';
+import { fontCatalogStore } from '$entities/Font/model';
 import { NavigationWrapper } from '$features/Breadcrumb';
 import type { ResponsiveManager } from '$shared/lib';
 import { cn } from '$shared/lib';