first commit

src/lib/format.ts

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+const FA_DIGITS = ["۰", "۱", "۲", "۳", "۴", "۵", "۶", "۷", "۸", "۹"];
+
+export function toFaDigits(input: string | number): string {
+  return String(input).replace(/\d/g, (d) => FA_DIGITS[Number(d)]);
+}
+
+// Prices come from the API in Toman.
+export function formatPrice(value: number | null | undefined): string {
+  if (value === null || value === undefined) return "";
+  return toFaDigits(value.toLocaleString("en-US"));
+}
+
+export function discountPercent(price: number, oldPrice: number): number {
+  if (!oldPrice || oldPrice <= price) return 0;
+  return Math.round(((oldPrice - price) / oldPrice) * 100);
+}
+
+// The static-image-slot API documents aspectRatio as "16:9", but CSS's
+// aspect-ratio property needs a slash ("16/9"), not a colon.
+export function toCssAspectRatio(value: string | number | null | undefined): string | undefined {
+  if (value === null || value === undefined || value === "") return undefined;
+  return String(value).replace(":", "/");
+}