Polish mobile and web experience

apps/web/src/lib/draft-invoice.ts

@@ -1,6 +1,11 @@
 /** Default invoice number format (matches web/mobile create forms). */
 export function generateInvoiceNumber(now = new Date()): string {
-  const date = now.toISOString().slice(0, 10).replace(/-/g, "");
+  const date = [
+    now.getFullYear(),
+    String(now.getMonth() + 1).padStart(2, "0"),
+    String(now.getDate()).padStart(2, "0"),
+  ].join("");
+
   return `INV-${date}-${String(now.getTime()).slice(-6)}`;
 }