fix: add missing UI components and utilities

- Add tabs.tsx component
- Add select.tsx component
- Add formatCurrency utility function
- Export new components from index

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/lib/utils.ts

@@ -4,3 +4,12 @@ import { twMerge } from 'tailwind-merge';
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs));
 }
+
+export function formatCurrency(value: number): string {
+  return new Intl.NumberFormat('es-MX', {
+    style: 'currency',
+    currency: 'MXN',
+    minimumFractionDigits: 0,
+    maximumFractionDigits: 0,
+  }).format(value);
+}