frontend tweaks, preview workspace

frontend/src/routes/DocumentViewerRoute.jsx

@@ -1,18 +1,13 @@
 import React, { useEffect } from 'react';
-import { useNavigate, useParams } from 'react-router-dom';
+import { Navigate, useNavigate, useParams } from 'react-router-dom';
 
 import { useAppShell } from '../appShellContext';
-import PreviewWorkspace from '../preview/PreviewWorkspace';
 
 const DocumentViewerRoute = () => {
   const {
     previewWorkspaceDocument,
-    previewWorkspaceEntry,
-    closeDocumentPreview,
-    handleThumbnailRegeneration,
     ensurePreviewData,
     notifyApiError,
-    resolveApiPath,
   } = useAppShell();
   const { documentId } = useParams();
   const navigate = useNavigate();
@@ -44,29 +39,15 @@ const DocumentViewerRoute = () => {
     };
   }, [documentId, ensurePreviewData, notifyApiError, navigate]);
 
-  const isReady =
-    documentId && previewWorkspaceDocument && previewWorkspaceDocument.id === documentId;
-
-  if (!isReady) {
-    return (
-      <main className="preview-main">
-        <div className="preview-workspace__message">Loading preview…</div>
-      </main>
-    );
+  if (!documentId) {
+    return <Navigate to="/documents" replace />;
   }
 
-  return (
-    <main className="preview-main">
-      <PreviewWorkspace
-        document={previewWorkspaceDocument}
-        previewEntry={previewWorkspaceEntry}
-        resolveApiPath={resolveApiPath}
-        onClose={closeDocumentPreview}
-        onRegenerateThumbnails={handleThumbnailRegeneration}
-      />
-    </main>
-  );
+  if (!previewWorkspaceDocument || previewWorkspaceDocument.id !== documentId) {
+    return <div className="preview-workspace__message">Loading preview…</div>;
+  }
+
+  return <Navigate to="/documents" replace />;
 };
 
 export default DocumentViewerRoute;
-