feat(documents): per-document custom-field print picker on offer/issued-order/invoice detail

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

src/admin/pages/OfferDetail.tsx

@@ -33,6 +33,7 @@ import SectionsEditor, {
   type DocumentSection,
 } from "../components/document/SectionsEditor";
 import LockBanner from "../components/document/LockBanner";
+import CustomFieldsPrintPicker from "../components/document/CustomFieldsPrintPicker";
 import { useDocumentLock } from "../hooks/useDocumentLock";
 import { useUnsavedChangesGuard } from "../hooks/useUnsavedChangesGuard";
 import { useDocumentPdf } from "../hooks/useDocumentPdf";
@@ -114,6 +115,7 @@ interface OfferSavePayload {
   language: string;
   items: OfferItemPayload[];
   sections: OfferSectionPayload[];
+  selected_custom_fields: number[];
   status?: string;
 }
 
@@ -178,6 +180,9 @@ export default function OfferDetail() {
     emptyDocumentItem(),
   ]);
   const [sections, setSections] = useState<DocumentSection[]>([]);
+  const [selectedCustomFields, setSelectedCustomFields] = useState<number[]>(
+    [],
+  );
   const [orderInfo, setOrderInfo] = useState<OfferOrderInfo | null>(null);
   const [offerStatus, setOfferStatus] = useState<string>("");
   const [quotationNumber, setQuotationNumber] = useState("");
@@ -318,6 +323,7 @@ export default function OfferDetail() {
           }))
         : [];
     setSections(mappedSections);
+    setSelectedCustomFields(d.selected_custom_fields ?? []);
     markClean({ form: formData, items: mappedItems, sections: mappedSections });
     setOfferStatus(d.status || "");
     setOrderInfo(d.order ?? null);
@@ -445,6 +451,7 @@ export default function OfferDetail() {
           content: s.content,
           position: i,
         })),
+        selected_custom_fields: selectedCustomFields,
       };
       // Only set status when a target is given (create-as-draft / create-as-live
       // / finalize). Editing a live offer sends no status — the backend keeps
@@ -929,6 +936,15 @@ export default function OfferDetail() {
               />
             </Field>
           </Box>
+
+          <Box sx={{ mt: 2 }}>
+            <CustomFieldsPrintPicker
+              fields={companySettings?.custom_fields ?? []}
+              selected={selectedCustomFields}
+              disabled={readOnly}
+              onChange={setSelectedCustomFields}
+            />
+          </Box>
         </Card>
 
         {/* Items (drag-and-drop, offers carry the "V ceně" column) */}