feat: add i18n and avatar upload

apps/frontend/src/lib/format.ts

@@ -1,21 +1,25 @@
-export function formatPrice(price: string | null | undefined, currency: string): string | null {
+export function formatPrice(
+  price: string | null | undefined,
+  currency: string,
+  locale?: string,
+): string | null {
   if (!price) return null;
   const n = Number(price);
   if (Number.isNaN(n)) return `${price} ${currency}`;
   try {
-    return new Intl.NumberFormat(undefined, {
+    return new Intl.NumberFormat(locale, {
       style: 'currency',
       currency,
       maximumFractionDigits: 2,
     }).format(n);
   } catch {
-    return `${n.toLocaleString()} ${currency}`;
+    return `${n.toLocaleString(locale)} ${currency}`;
   }
 }
 
-export function formatDate(iso: string | Date): string {
+export function formatDate(iso: string | Date, locale?: string): string {
   const d = typeof iso === 'string' ? new Date(iso) : iso;
-  return d.toLocaleDateString(undefined, { day: 'numeric', month: 'short', year: 'numeric' });
+  return d.toLocaleDateString(locale, { day: 'numeric', month: 'short', year: 'numeric' });
 }
 
 export function daysLeftUntil(iso: string | Date, retentionDays: number): number {