Design/Specs/Media processing

While uploading media (don't mind the awful color and padding):

In case of upload errors:

These indicators are links to the media processing panel, which currently looks like this, but should look more like this:

All uploads from the last 24 hours are shown ("View older media" loads older entries). Uploads are sorted by (reverse) entry time. Uploads currently being processed and failed uploads are shown with a different background color.