feat(posteingang): Duplikat als neue Version oder verwerfen

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

paperless-frontend/src/api/inbox.ts

@@ -87,7 +87,7 @@ export const inboxApi = {
 
   postprocess: (
     id: string,
-    opts?: { sectionOffset?: number; processOnlyOne?: boolean; replaceDuplicate?: boolean },
+    opts?: { sectionOffset?: number; processOnlyOne?: boolean; entscheidung?: PaperlessEntscheidung },
   ) =>
     api
       .post<{ results: PostprocessActionResult[]; totalSections: number }>(
@@ -132,6 +132,9 @@ export const inboxApi = {
     api.post(`/api/inbox/${encodeURIComponent(id)}/send-email`, body).then(() => {}),
 };
 
+/** Entscheidung des Benutzers zu einem Duplikat bei „An Paperless senden“ */
+export type PaperlessEntscheidung = { aktion: 'version'; documentId: number } | { aktion: 'verwerfen' };
+
 export interface PostprocessActionResult {
   sectionIndex: number;
   actionId: number;
@@ -140,6 +143,10 @@ export interface PostprocessActionResult {
   skipped?: boolean;
   message?: string;
   duplicateOfDocumentId?: number;
+  /** Duplikat mit genau einem Stammdokument → neue Version möglich */
+  versionMoeglich?: boolean;
+  duplikatKandidaten?: number[];
+  verworfen?: boolean;
 }
 
 export const clientsApi = {

paperless-frontend/src/pages/InboxDetailPage.tsx

@@ -22,7 +22,7 @@ import {
   ZoomInOutlined,
   ZoomOutOutlined,
 } from '@ant-design/icons';
-import { inboxApi, type InboxBarcode, type InboxFile, type PostprocessActionResult } from '../api/inbox';
+import { inboxApi, type InboxBarcode, type InboxFile, type PaperlessEntscheidung, type PostprocessActionResult } from '../api/inbox';
 import { paperlessApi } from '../api/paperless';
 import { userSettingsApi, type SenderOption } from '../api/userSettings';
 import { useIsMobile } from '../hooks/useIsMobile';
@@ -259,7 +259,7 @@ function PostprocessWizardModal({
     setSteps((prev) => prev.map((s, i) => (i === idx ? { ...s, ...patch } as WizardStep : s)));
   };
 
-  const processSection = async (idx: number, replaceDuplicate = false) => {
+  const processSection = async (idx: number, entscheidung?: PaperlessEntscheidung) => {
     if (!documentId) return;
     setBusy(true);
     setStepAt(idx, { status: 'processing', message: undefined });
@@ -267,7 +267,7 @@ function PostprocessWizardModal({
       const { results } = await inboxApi.postprocess(documentId, {
         sectionOffset: idx,
         processOnlyOne: true,
-        replaceDuplicate,
+        entscheidung,
       });
       const skipped = results.find((r) => r.skipped);
       const failed = results.filter((r) => !r.ok);
@@ -304,8 +304,10 @@ function PostprocessWizardModal({
   }, [open, currentSection, awaitingDecision, finished, busy, sectionCount]);
 
   const handleReplace = () => {
+    const documentId = steps[currentSection]?.results?.find((r) => r.versionMoeglich)?.duplicateOfDocumentId;
+    if (documentId === undefined) return;
     setAwaitingDecision(false);
-    void processSection(currentSection, true);
+    void processSection(currentSection, { aktion: 'version', documentId });
   };
 
   const handleSkip = () => {