Every card here is a <template> inside one <cnc-desktop>. Drag one by its title bar toward a side: it shrinks, and docks where it is let go.
<template>
<cnc-desktop>
cnc-desktop: tiles that float, dock at the edges and maximize into split panes.
Next: Draw tiles at every size
This tile starts closed: search for it (/) or find it with the left edge's filter.