feat: add functionality to manually split documents at specific pages via the UI and API

paperless-frontend/src/pages/InboxDetailPage.tsx

@@ -10,6 +10,7 @@ import {
   QrcodeOutlined,
   RedoOutlined,
   RightOutlined,
+  ScissorOutlined,
   ThunderboltOutlined,
   UndoOutlined,
   UserOutlined,
@@ -35,11 +36,12 @@ function buildDocuments(
   pageCount: number,
   splitPages: number[],
   deletedPages: number[],
+  manualSplitPages: number[],
   barcodes: InboxBarcode[],
 ): DocumentSegment[] {
   if (pageCount === 0) return [];
   const deleted = new Set(deletedPages);
-  const splits = new Set(splitPages.filter((p) => !deleted.has(p)));
+  const splits = new Set([...splitPages, ...manualSplitPages].filter((p) => !deleted.has(p)));
 
   const docs: DocumentSegment[] = [];
   let current: number[] = [];
@@ -570,7 +572,7 @@ export default function InboxDetailPage() {
     const splitPages = file.barcodes
       .filter((b) => b.splitBefore)
       .map((b) => b.page);
-    return buildDocuments(file.pageCount, splitPages, file.deletedPages, file.barcodes);
+    return buildDocuments(file.pageCount, splitPages, file.deletedPages, file.manualSplitPages, file.barcodes);
   }, [file]);
 
   const effectivePages = useMemo<number[]>(() => {
@@ -700,6 +702,18 @@ export default function InboxDetailPage() {
   };
 
 
+  const handleToggleSplit = async () => {
+    if (!file) return;
+    try {
+      await inboxApi.toggleSplit(file.id, selectedPage);
+      const list = await inboxApi.list();
+      const refreshed = list.find((f) => f.id === file.id) ?? null;
+      if (refreshed) setFile(refreshed);
+    } catch {
+      message.error('Trennung konnte nicht gespeichert werden');
+    }
+  };
+
   const handleResetEdits = async () => {
     if (!file) return;
     try {
@@ -846,16 +860,16 @@ export default function InboxDetailPage() {
   const canPrev = effectiveIndex > 0;
   const canNext = effectiveIndex >= 0 && effectiveIndex < effectivePages.length - 1;
   const canDelete = effectivePages.length > 1;
+  const isSplitPage = file.manualSplitPages.includes(selectedPage);
+  const canSplit = selectedPage !== currentDoc?.pages[0];
   const rotationCount = Object.keys(file.rotations ?? {}).length;
-  const pendingEdits = file.deletedPages.length + rotationCount;
+  const manualSplitCount = file.manualSplitPages.length;
+  const pendingEdits = file.deletedPages.length + rotationCount + manualSplitCount;
   const editsLabel = (() => {
     const parts: string[] = [];
-    if (file.deletedPages.length > 0) {
-      parts.push(`${file.deletedPages.length} zur Löschung markiert`);
-    }
-    if (rotationCount > 0) {
-      parts.push(`${rotationCount} gedreht`);
-    }
+    if (file.deletedPages.length > 0) parts.push(`${file.deletedPages.length} zur Löschung markiert`);
+    if (rotationCount > 0) parts.push(`${rotationCount} gedreht`);
+    if (manualSplitCount > 0) parts.push(`${manualSplitCount} manuell getrennt`);
     return parts.join(' · ');
   })();
 
@@ -1211,6 +1225,18 @@ export default function InboxDetailPage() {
               </Tooltip>
             )}
             <span style={{ width: 1, height: 20, background: 'rgba(255,255,255,0.2)' }} />
+            {canSplit && (
+              <Tooltip title={isSplitPage ? 'Manuelle Trennung aufheben' : 'Vor dieser Seite trennen'}>
+                <Button
+                  type="text"
+                  shape="circle"
+                  icon={<ScissorOutlined style={{ fontSize: 16 }} />}
+                  onClick={handleToggleSplit}
+                  style={{ color: isSplitPage ? '#ffd666' : '#fff' }}
+                />
+              </Tooltip>
+            )}
+            <span style={{ width: 1, height: 20, background: 'rgba(255,255,255,0.2)' }} />
             <Tooltip title={scanMode ? 'Bereich-Scan abbrechen' : 'QR-Code in Bereich scannen'}>
               <Button
                 type="text"