✨feature: Add folder creation for recursive transfers and transfer progress indicator

src/preload.js

@@ -7,4 +7,5 @@ contextBridge.exposeInMainWorld('oddl', {
   listRemoteDir: (url) => ipcRenderer.invoke('list-remote-dir', url),
   downloadItem: (payload) => ipcRenderer.invoke('download-item', payload),
   onLog: (callback) => ipcRenderer.on('log', (_event, message) => callback(message)),
-});
+  onProgress: (callback) => ipcRenderer.on('progress', (_event, payload) => callback(payload)),
+});