admin: Superforms + Zod validation, three-address-defaults schema, profiles toast fix

- Add Superforms + Zod 4 for all admin form validation
- Replace address isDefault with three separate boolean defaults (Mailing, Billing, Shipping)
- Update profiles page with three-checkbox address form and toast improvements
- Convert all admin page server actions to pass request directly to crud
- Export superFormErrorsToFieldErrors helper for profiles server actions
- Regenerate Prisma client for new schema fields

src/routes/(protected)/+layout.svelte

@@ -48,9 +48,7 @@
 					{#each adminModels as model}
 						<a
 							href="/admin/{model.slug}"
-							class="rounded px-3 py-1 text-sm transition-colors {isActive(
-								'/admin/' + model.slug
-							)
+							class="rounded px-3 py-1 text-sm transition-colors {isActive('/admin/' + model.slug)
 								? 'bg-blue-50 text-blue-700 dark:bg-gray-800 dark:text-gray-100'
 								: 'text-blue-600 hover:bg-gray-50 hover:text-blue-800 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-gray-100'}"
 						>