docs(ComparisonView): document the injected store fields

#fontCatalog / #typography / #lifecycle lacked the per-field doc the rest
of the class uses.

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

@@ -97,11 +97,17 @@ export class ComparisonStore {
      * TanStack Query-backed store for efficient batch font retrieval
      */
     #fontsByIdsStore: FontsByIdsStore;
-
+    /**
+     * Paginated font catalog — source of fonts for default seeding.
+     */
     #fontCatalog: FontCatalogStore;
-
+    /**
+     * Typography settings applied to the rendered comparison.
+     */
     #typography: TypographySettingsStore;
-
+    /**
+     * Font load/cache/eviction manager; pinned to keep compared fonts resident.
+     */
     #lifecycle: FontLifecycleManager;
     /**
      * Per-instance persistent storage for the selected comparison fonts.