[BUG] [WCR] Requesting too large of a scaled image freezes app and leads to long wait time

[zateutsch]

Noticed this when I was working with WCR before, but if you scale an image that's already large or with a larger scale factor, it will freeze out the app and take forever.

Possible solution:
make the scale slider relative to the uploaded image thats bound on the larger of the two dimensions of the image, and maintains the aspect ratio of the image when slid.

We could then max out resolution to something like 4000px for the larger of the dimensionalities, and the slider could go from [Original Image Size] => [Max Determined Output Size for Reasonable Performance]

If this just took a long time, I don't think it would be a problem, but the fact that it is freezing the app is bad. Maybe there's just a tasking fix to this as well so it can happen on the background.