* fix(scanner): Always refresh folder image time when adding first image
Currently, the `images_updated_at` field is only set to the image modification time.
However, in cases where a new image is added _and_ said image is older than the folder mod time, the field is not updated properly.
In this the case where `images_updated_at` is null (no images were ever added) and a new images is found, use the folder modification time instead of image modification time.
**Note**, this doesn't handle cases such as replacing a newer image with an older one.
* simplify image update at
* we don't want to set imagesUpdatedAt when there's no images in the folder
Signed-off-by: Deluan <deluan@navidrome.org>
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Signed-off-by: Deluan <deluan@navidrome.org>
Co-authored-by: Deluan <deluan@navidrome.org>
