* black background
* fix backend logic
* fixes
* ensure data being sent to api is segment aligned
* tweak
* tweaks to keep motion review as-is
* fix for half segment fractional seconds when using zooming
* Indicate no recordings on the history timeline with gray hash marks
This commit includes a new backend API endpoint and the frontend changes needed to support this functionality
* don't show slashes for now
* virtualize event segments
* use virtual segments in event review timeline
* add segmentkey to props
* virtualize motion segments
* use virtual segments in motion review timeline
* update draggable element hook to use only math
* timeline zooming hook
* add zooming to event review timeline
* update playground
* zoomable timeline on recording view
* consolidate divs in summary timeline
* only calculate motion data for visible motion segments
* use swr loading state
* fix motion only
* keep handlebar centered when zooming
* zoom animations
* clean up
* ensure motion only checks both halves of segment
* prevent handlebar jump when using motion only mode
