feat(k1c): live camera stream instead of snapshotsHEADmaster

The camera was a snapshot reloaded on every poll. It is now the
webcam's MJPEG stream_url, which an <img> plays by itself at the
camera's own rate (15 fps on the K1C). The stream connects only while
the K1C tab is on screen and the page visible, and disconnects
otherwise, so a hidden tab does not keep the printer streaming. A
dropped stream hides the image and reconnects on the next poll. The
image is shown as soon as its source is set, since a never-ending
stream may never fire load.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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