feat: implement invoice formatting and document loading hooks

distribution_fe/components/invoice/invoice-format.ts

@@ -0,0 +1,19 @@
+// Shared number/date formatting for printed invoices.
+
+/** `Rs. 12,450.00` — thousands separator, exactly 2 decimals. */
+export const fmtMoney = (n: number) =>
+  `Rs. ${n.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`
+
+/** Quantity: up to 3 decimals, trailing zeros dropped. */
+export const fmtQty = (n: number) => n.toLocaleString('en-US', { maximumFractionDigits: 3 })
+
+/** `dd/MM/yyyy` */
+export function fmtDate(v: string | null | undefined) {
+  if (!v) return '—'
+  const d = new Date(v)
+  const dd = String(d.getDate()).padStart(2, '0')
+  const mm = String(d.getMonth() + 1).padStart(2, '0')
+  return `${dd}/${mm}/${d.getFullYear()}`
+}
+
+export const invoiceNo = (id: string) => `INV-${id.substring(0, 8).toUpperCase()}`