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

@@ -20,9 +20,10 @@ import {
 } from '$entities/Font';
 import {
     type FontCatalogStore,
+    type FontLifecycleManager,
     FontsByIdsStore,
-    fontLifecycleManager,
     getFontCatalog,
+    getFontLifecycleManager,
 } from '$entities/Font/model';
 import {
     type TypographySettingsStore,
@@ -106,12 +107,15 @@ export class ComparisonStore {
 
     #typography: TypographySettingsStore;
 
+    #lifecycle: FontLifecycleManager;
+
     constructor() {
         // Synchronously seed the batch store with any IDs already in storage
         const { fontAId, fontBId } = storage.value;
         this.#fontsByIdsStore = new FontsByIdsStore(fontAId && fontBId ? [fontAId, fontBId] : []);
         this.#fontCatalog = getFontCatalog();
         this.#typography = getTypographySettingsStore();
+        this.#lifecycle = getFontLifecycleManager();
 
         $effect.root(() => {
             // Sync batch results → fontA / fontB
@@ -161,7 +165,7 @@ export class ComparisonStore {
                 });
 
                 if (configs.length > 0) {
-                    fontLifecycleManager.touch(configs);
+                    this.#lifecycle.touch(configs);
                     this.#checkFontsLoaded();
                 }
             });
@@ -203,17 +207,17 @@ export class ComparisonStore {
                 const fb = this.#fontB;
                 const w = this.#typography.weight;
                 if (fa) {
-                    fontLifecycleManager.pin(fa.id, w, fa.features?.isVariable);
+                    this.#lifecycle.pin(fa.id, w, fa.features?.isVariable);
                 }
                 if (fb) {
-                    fontLifecycleManager.pin(fb.id, w, fb.features?.isVariable);
+                    this.#lifecycle.pin(fb.id, w, fb.features?.isVariable);
                 }
                 return () => {
                     if (fa) {
-                        fontLifecycleManager.unpin(fa.id, w, fa.features?.isVariable);
+                        this.#lifecycle.unpin(fa.id, w, fa.features?.isVariable);
                     }
                     if (fb) {
-                        fontLifecycleManager.unpin(fb.id, w, fb.features?.isVariable);
+                        this.#lifecycle.unpin(fb.id, w, fb.features?.isVariable);
                     }
                 };
             });