refactor(ComparisonView): unify pretext font string generation with a utility function

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

@@ -24,6 +24,7 @@ import {
 import { typographySettingsStore } from '$features/SetupFont/model';
 import { createPersistentStore } from '$shared/lib';
 import { untrack } from 'svelte';
+import { getPretextFontString } from '../../lib';
 
 /**
  * Storage schema for comparison state
@@ -205,8 +206,8 @@ export class ComparisonStore {
             return;
         }
 
-        const fontAString = `${weight} ${size}px "${fontAName}"`;
-        const fontBString = `${weight} ${size}px "${fontBName}"`;
+        const fontAString = getPretextFontString(weight, size, fontAName);
+        const fontBString = getPretextFontString(weight, size, fontBName);
 
         // Check if already loaded to avoid UI flash
         const isALoaded = document.fonts.check(fontAString);