fix(drafts): resync invoice number field after in-place draft→issued finalize

Mirrors the issued-order po_number resync so all three detail pages
surface the freshly-assigned number after finalize without a reload.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/pages/InvoiceDetail.tsx

@@ -634,6 +634,20 @@ export default function InvoiceDetail() {
     };
   }, []);
 
+  // After an in-place draft→issued finalize, the one-shot hydration effect below
+  // (gated by dataReady) won't re-run, so the freshly-assigned number from the
+  // refetched query is mirrored into the local field here (matches the
+  // issued-order page's po_number resync).
+  useEffect(() => {
+    if (
+      isEdit &&
+      invoice?.invoice_number &&
+      invoice.invoice_number !== invoiceNumber
+    ) {
+      setInvoiceNumber(invoice.invoice_number);
+    }
+  }, [isEdit, invoice?.invoice_number, invoiceNumber]);
+
   // ─── Sync query data to form state ───
 
   // Edit mode: populate form from invoice data