feat: Add an Ollama-based PDF OCR script and refactor frontend folder tree management with a new FoldersManager and useSyncExternalStore.

frontend/src/documents/data/useDocumentsWorkspace.ts

@@ -139,6 +139,15 @@ const useDocumentsWorkspace = ({
   const routeFolderId = folderMatch?.params?.folderId || null;
   const routeDocumentId = docMatch?.params?.documentId || null;
   const previewDocumentId = routeDocumentId;
+
+  const handleBreadcrumbNavigate = useCallback((crumb: { id?: Identifier | string } | null) => {
+    if (!crumb || !crumb.id) {
+      return;
+    }
+    const target = crumb.id === 'root' ? '/documents' : `/documents/folder/${crumb.id}`;
+    navigate(target);
+  }, [navigate]);
+
   const {
     status: appStatus,
     token,
@@ -1310,6 +1319,7 @@ const useDocumentsWorkspace = ({
     documentsFilter,
     documentsManager,
     foldersManager,
+    handleBreadcrumbNavigate,
   };
 
   // hook callers handle rendering / routing