2-column layout: settings toggle switches dashboard between 1-col
(current behaviour) and 2-col (Camera|Progress, Temps|AMS side by
side, motion cards in 2×2). Preference stored in localStorage only
(per-browser, not printer config). Mobile always stays 1-col via CSS.
Local timelapse: new TimelapseSpool class captures JPEG frames from
the camera stream during a print at a configurable interval (default
4s) and encodes them to MP4 with ffmpeg on print end. Stored in
data/timelapses/, indexed in SQLite. New /kx/timelapses API + browser
tab in the file store panel with download and delete. Also wires the
undocumented printer-native timelapse MQTT field as an experimental
opt-in setting.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
