Add file rename functionality and improve preview handling

- Implement file/folder rename feature with dialog and API endpoint
- Add rename button to file browser with keyboard shortcuts
- Switch PDF preview from object to embed tag for better compatibility
- Fix CORS issues by fetching preview files as blobs with object URLs
- Add proper cleanup for object URLs to prevent memory leaks
- Add renameObject utility function for MinIO operations

server/utils/minio.ts

@@ -136,7 +136,13 @@ export const getDownloadUrl = async (fileName: string, expiry: number = 60 * 60)
   const bucketName = useRuntimeConfig().minio.bucketName;
   
   // Extract just the filename from the full path
-  const filename = fileName.split('/').pop() || fileName;
+  let filename = fileName.split('/').pop() || fileName;
+  
+  // Remove timestamp prefix if present (e.g., "1234567890-filename.pdf" -> "filename.pdf")
+  const timestampMatch = filename.match(/^\d{10,}-(.+)$/);
+  if (timestampMatch) {
+    filename = timestampMatch[1];
+  }
   
   // Force download with Content-Disposition header
   const responseHeaders = {
@@ -220,3 +226,74 @@ export const getPreviewUrl = async (fileName: string, contentType: string) => {
   
   return await client.presignedGetObject(bucketName, fileName, 60 * 60, responseHeaders);
 };
+
+// Rename file (copy and delete)
+export const renameFile = async (oldPath: string, newPath: string) => {
+  const client = getMinioClient();
+  const bucketName = useRuntimeConfig().minio.bucketName;
+  
+  try {
+    // Copy the object to the new name
+    await client.copyObject(
+      bucketName,
+      newPath,
+      `/${bucketName}/${oldPath}`
+    );
+    
+    // Delete the old object
+    await client.removeObject(bucketName, oldPath);
+    
+    return true;
+  } catch (error) {
+    console.error('Error renaming file:', error);
+    throw error;
+  }
+};
+
+// Rename folder (copy all contents and delete)
+export const renameFolder = async (oldPath: string, newPath: string) => {
+  const client = getMinioClient();
+  const bucketName = useRuntimeConfig().minio.bucketName;
+  
+  // Ensure paths end with /
+  const oldPrefix = oldPath.endsWith('/') ? oldPath : oldPath + '/';
+  const newPrefix = newPath.endsWith('/') ? newPath : newPath + '/';
+  
+  // List all objects in the folder
+  const objectsList: string[] = [];
+  
+  return new Promise((resolve, reject) => {
+    const stream = client.listObjectsV2(bucketName, oldPrefix, true);
+    
+    stream.on('data', (obj) => {
+      if (obj && obj.name) {
+        objectsList.push(obj.name);
+      }
+    });
+    
+    stream.on('error', reject);
+    
+    stream.on('end', async () => {
+      try {
+        // Copy all objects to new location
+        for (const objectName of objectsList) {
+          const newObjectName = objectName.replace(oldPrefix, newPrefix);
+          await client.copyObject(
+            bucketName,
+            newObjectName,
+            `/${bucketName}/${objectName}`
+          );
+        }
+        
+        // Delete all old objects
+        if (objectsList.length > 0) {
+          await client.removeObjects(bucketName, objectsList);
+        }
+        
+        resolve(true);
+      } catch (error) {
+        reject(error);
+      }
+    });
+  });
+};