fix

frontend/src/detail/DetailPanel.jsx

@@ -782,6 +782,24 @@ const DetailPanel = ({
     }
   }, [zoomedPreview, zoomDisplay]);
 
+  const {
+    documentId: singleNavigatorDocId,
+    asset: singleNavigatorAsset,
+    ordinal: singleNavigatorOrdinal,
+    canGoPrev: singleNavigatorCanGoPrev,
+    canGoNext: singleNavigatorCanGoNext,
+    cardinality: singleNavigatorCardinality,
+  } = singlePreviewNavigator;
+
+  const {
+    documentId: stackNavigatorDocId,
+    asset: stackNavigatorAsset,
+    ordinal: stackNavigatorOrdinal,
+    canGoPrev: stackNavigatorCanGoPrev,
+    canGoNext: stackNavigatorCanGoNext,
+    cardinality: stackNavigatorCardinality,
+  } = stackPreviewNavigator;
+
   useEffect(() => {
     if (typeof ensureAssetUrl !== 'function') {
       return;
@@ -829,22 +847,40 @@ const DetailPanel = ({
       requests.forEach((promise) => promise?.catch?.(() => {}));
     };
 
-    warmNavigator(singlePreviewNavigator);
-    warmNavigator(stackPreviewNavigator);
+    const singleWarmState = {
+      documentId: singleNavigatorDocId,
+      asset: singleNavigatorAsset,
+      ordinal: singleNavigatorOrdinal,
+      canGoPrev: singleNavigatorCanGoPrev,
+      canGoNext: singleNavigatorCanGoNext,
+      cardinality: singleNavigatorCardinality,
+    };
+
+    const stackWarmState = {
+      documentId: stackNavigatorDocId,
+      asset: stackNavigatorAsset,
+      ordinal: stackNavigatorOrdinal,
+      canGoPrev: stackNavigatorCanGoPrev,
+      canGoNext: stackNavigatorCanGoNext,
+      cardinality: stackNavigatorCardinality,
+    };
+
+    warmNavigator(singleWarmState);
+    warmNavigator(stackWarmState);
   }, [
     ensureAssetUrl,
-    singlePreviewNavigator,
-    singlePreviewNavigator.documentId,
-    singlePreviewNavigator.asset,
-    singlePreviewNavigator.ordinal,
-    singlePreviewNavigator.canGoPrev,
-    singlePreviewNavigator.canGoNext,
-    stackPreviewNavigator,
-    stackPreviewNavigator.documentId,
-    stackPreviewNavigator.asset,
-    stackPreviewNavigator.ordinal,
-    stackPreviewNavigator.canGoPrev,
-    stackPreviewNavigator.canGoNext,
+    singleNavigatorDocId,
+    singleNavigatorAsset,
+    singleNavigatorOrdinal,
+    singleNavigatorCanGoPrev,
+    singleNavigatorCanGoNext,
+    singleNavigatorCardinality,
+    stackNavigatorDocId,
+    stackNavigatorAsset,
+    stackNavigatorOrdinal,
+    stackNavigatorCanGoPrev,
+    stackNavigatorCanGoNext,
+    stackNavigatorCardinality,
   ]);
 
   const renderSingle = () => {

frontend/src/index.jsx

@@ -4480,14 +4480,14 @@ const AppLayout = () => {
         }
 
         if (!docIds.length) {
-        try {
-          const single = event.dataTransfer.getData('application/x-papercrate-doc');
-          if (single) {
-            docIds = [single];
+          try {
+            const single = event.dataTransfer.getData('application/x-papercrate-doc');
+            if (single) {
+              docIds = [single];
+            }
+          } catch (error) {
+            console.warn('[documents] Failed to read single document drag payload', error);
           }
-        } catch (error) {
-          console.warn('[documents] Failed to read single document drag payload', error);
-        }
         }
 
         if (!docIds.length && draggedDocumentIds.length) {