chore: add export/import and remove unused ones

src/shared/lib/helpers/index.ts

@@ -31,3 +31,5 @@ export {
     createCharacterComparison,
     type LineData,
 } from './createCharacterComparison/createCharacterComparison.svelte';
+
+export { createPersistentStore } from './createPersistentStore/createPersistentStore.svelte';