refactor(font): replace fontLifecycleManager singleton with lazy accessor

Convert the eager fontLifecycleManager singleton to getFontLifecycleManager()
(+ __resetFontLifecycleManager for tests), so its AbortController/FontFace
bookkeeping is set up on first use rather than at module load. Update consumers
(FontVirtualList, FontList, SampleList) and resolve it once as a field in
comparisonStore; the comparisonStore mock now exposes getFontLifecycleManager.

src/entities/Font/ui/FontVirtualList/FontVirtualList.svelte

@@ -15,8 +15,8 @@ import { createFontLoadRequestContfig } from '../../lib/createFontLoadRequestCon
 import {
     type FontLoadRequestConfig,
     type UnifiedFont,
-    fontLifecycleManager,
     getFontCatalog,
+    getFontLifecycleManager,
 } from '../../model';
 
 interface Props extends
@@ -53,6 +53,7 @@ let {
 }: Props = $props();
 
 const fontCatalog = getFontCatalog();
+const fontLifecycleManager = getFontLifecycleManager();
 
 const isLoading = $derived<boolean>(fontCatalog?.isLoading);
 const isFetching = $derived<boolean>(fontCatalog.isFetching);