[KBRASK]

0.5.1: Installing only an image model works again, and the image view shows its pictures again. Uploads show progress, and the update notice, retry notice and reference Add menu are clearer.

• Install: installing only an image model no longer fails at the verification step for lacking video model folders; the check for a video install is unchanged.
• Image view: the large picture, the work thumbnails and the save link no longer return 404.
• Uploads: while a file is uploaded or an edited image is saved, the media panel shows how much has been sent.
• Update notice: it is a full-width bar, under the header in the studio and as the second row of the node toolbar.
• Retry notice: when a run is retried, the notice says the run mode changes, and names less video memory or less memory by cause, instead of saying settings change.
• Reference Add menu: it opens above when there is no room below, takes the full width on narrow windows and shows four columns at 400 px wide.
• Studio: the mention list refreshes when a tour sample fills the prompt.
• Tutorial and tour: video and audio references are added with Add, the same way as images, and the first-and-last-frame step no longer repeats Add.
• Agent: the width and height descriptions state the nearest-multiple-of-32 rule, and whole-timeline write points to the editor operations for clip edits.
• Image view: when there are many works, the thumbnails in the works column are shown in full instead of being squeezed into thin strips.
• Image view: the large picture shows square, portrait and landscape pictures whole at every width.