refactor(ComparisonView): import typography store via root barrel

comparisonStore reached getTypographySettingsStore through
$features/AdjustTypography/model (deep, past the public API) while the
catalog/lifecycle accessors already go through the $entities/Font root
barrel. Re-path to $features/AdjustTypography so all three composed-store
imports go through public APIs uniformly. Direction was always legal
(widget -> feature, downward); this only closes the deep-import
inconsistency.

Consolidate the spec mock onto the root module accordingly and drop the
now-dead /model mock.

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

@@ -26,7 +26,7 @@ import {
 import {
     type TypographySettingsStore,
     getTypographySettingsStore,
-} from '$features/AdjustTypography/model';
+} from '$features/AdjustTypography';
 import { createPersistentStore } from '$shared/lib';
 import { untrack } from 'svelte';
 import { getPretextFontString } from '../../lib';