fix: reset lastPacket on signout

src/main/services/download/download-manager.ts

@@ -234,6 +234,8 @@ export class DownloadManager {
     });
 
     WindowManager.mainWindow?.setProgressBar(-1);
+    WindowManager.mainWindow?.webContents.send("on-download-progress", null);
+
     if (downloadKey === this.downloadingGameId) {
       this.downloadingGameId = null;
     }