Add savings chat analysis feature

src/lib/format.ts

@@ -29,6 +29,17 @@ export function formatAmount(amount: number): string {
   return eur.format(amount);
 }
 
+export function formatEurCompact(value: number): string {
+  const abs = Math.abs(value);
+  const sign = value < 0 ? "-" : "";
+  const suffix = (n: number, digits = 1) =>
+    `${sign}${n.toFixed(digits).replace(".", ",")}`;
+  if (abs >= 1_000_000) return `${suffix(abs / 1_000_000)} Mio. €`;
+  if (abs >= 10_000) return `${suffix(abs / 1000)}k €`;
+  if (abs >= 1000) return `${suffix(abs / 1000, 2)}k €`;
+  return eur.format(value);
+}
+
 export function amountClass(amount: number): string {
   if (amount < 0) return "text-red-600 dark:text-red-400";
   if (amount > 0) return "text-emerald-600 dark:text-emerald-400";