feat(clearance): preview charge documents before and after upload

apps/edr-freight-api/src/modules/bookings/clearance.util.ts

@@ -146,3 +146,20 @@ export function clearanceDocumentsOpen(booking: Booking): boolean {
   if (booking.paymentStatus === 'PAID') return false;
   return true;
 }
+
+/**
+ * The label the customer typed for an ad-hoc clearance document, recovered from
+ * its file code. The portal encodes it as `custom_<slug>_<n>`; a plain
+ * `custom_<n>` (older uploads, or an unnamed row) yields null so callers fall
+ * back to the filename.
+ */
+export function adHocLabel(fileKey: string): string | null {
+  const m = /^custom_(.+)_\d+$/.exec(fileKey);
+  if (!m) return null;
+  // Legacy keys are `custom_<timestamp>_<n>`, which this regex reads as a label
+  // of digits. Those carry no name — reject them so the caller falls back to
+  // the filename instead of showing "1755780000000".
+  if (/^\d+$/.test(m[1])) return null;
+  const label = m[1].replace(/-/g, ' ').trim();
+  return label ? label.charAt(0).toUpperCase() + label.slice(1) : null;
+}