feat(catalog): toggle stile catalogo classico/moderno

Aggiunge un checkbox nelle impostazioni utente per scegliere lo stile del
catalogo (classico vs moderno) + flag globale catalog.classic.style in
ui-config.json come default per tutti. Override per-utente in localStorage.

src/hooks/catalog/index.ts

@@ -1,4 +1,5 @@
 export * from './useCatalog';
+export * from './useCatalogClassicStyle';
 export * from './useCatalogFavorites';
 export * from './useCatalogPlaceMultipleItems';
 export * from './useCatalogSkipPurchaseConfirmation';

src/hooks/catalog/useCatalogClassicStyle.ts

@@ -0,0 +1,14 @@
+import { useBetween } from 'use-between';
+import { GetConfigurationValue, LocalStorageKeys } from '../../api';
+import { useLocalStorage } from '../useLocalStorage';
+
+// Per-user toggle for the catalog visual style.
+//  - true  => classic (old) catalog look
+//  - false => modern (rebuilt) catalog look
+// The default for users who never touched the toggle comes from the global
+// `catalog.classic.style` flag in ui-config.json, so an admin can flip the
+// default for everyone (true = classic for all, false = modern for all)
+// while still letting each user override it from the settings panel.
+const useCatalogClassicStyleState = () => useLocalStorage<boolean>(LocalStorageKeys.CATALOG_CLASSIC_STYLE, GetConfigurationValue<boolean>('catalog.classic.style', false));
+
+export const useCatalogClassicStyle = () => useBetween(useCatalogClassicStyleState);