Fix: thumbnail worker payload for non-xlsx files and change timeout to interval for thumbnail updates

backend/workers/thumbnails.go

@@ -167,12 +167,15 @@ func generateOfficeThumbnail(filePath, destPath string, cfg *config.Config) erro
 			"width":  1024,
 			"height": 1024,
 		},
-		"spreadsheetLayout": map[string]interface{}{
+	}
+
+	if ext == "xlsx" {
+		payload["spreadsheetLayout"] = map[string]interface{}{
 			"ignorePrintArea": true,
 			"printGridlines":  true,
 			"printHeadings":   true,
 			"fitToWidth":      1,
-		},
+		}
 	}
 
 	payloadBytes, err := json.Marshal(payload)

frontend/src/components/FileExplorer.tsx

@@ -375,14 +375,13 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
     }
   }, [currentPath, activeSection]);
 
-  // Refresh files after editing to catch the debounced thumbnail generation
+  // Refresh files periodically after editing to catch debounced background thumbnail generation
   useEffect(() => {
     if (!editingFile && activeSection === 'files') {
+      const timer = setInterval(() => {
         loadFiles(currentPath, true);
-      const timer = setTimeout(() => {
+      }, 15000);
-        loadFiles(currentPath, true);
+      return () => clearInterval(timer);
-      }, 12000);
-      return () => clearTimeout(timer);
     }
   }, [editingFile, activeSection, currentPath, loadFiles]);
 

frontend/src/components/OfficeHome.tsx

@@ -123,11 +123,11 @@ export default function OfficeHome({ type, onFileSelect, onCreateBlank, onPinCha
     fetchFiles();
     api.createDownloadToken().then(setDownloadToken).catch(console.error);
 
-    // Refresh files after 12 seconds to catch any debounced thumbnail updates from recent edits
+    // Refresh files periodically to catch any debounced thumbnail updates from recent edits
-    const timer = setTimeout(() => {
+    const timer = setInterval(() => {
       fetchFiles();
-    }, 12000);
+    }, 15000);
-    return () => clearTimeout(timer);
+    return () => clearInterval(timer);
   }, [type]);
 
   // Close context menu on click elsewhere