[Bug]: Playlist downloads do not allow format selection

Observed behavior and screenshots

When downloading a single video, the user can select the desired output format.

However, when downloading a playlist, there is no option to select the download format. The playlist is downloaded using the default WebM format instead. This causes an error when the application attempts to embed the thumbnail, since WebM is not a supported format for thumbnail embedding: *ERROR: Postprocessing: Supported filetypes for thumbnail embedding are: mp3, mkv/mka, ogg/opus/flac, m4a/mp4/m4v/mov

• *translated by ChatGPT

Logs or screenshots

No response

App version

2.1.0

OS version

Windows 11 25H2