- "A page with a sticky ColumnHead must declare fadeTop: false" lived in
prose: a registry flag on three pages plus an App special case for the
Channels card layout, and the next table page would have re-acquired the
fade-on-the-header defect with every lane green. ColumnHead now registers
itself with the enclosing PageScroller (ui/stickyTop) while mounted; the
registry flag, the App branch and the prop plumbing are gone. Measured on
localdev: the top mask is 0px under Channels' and Audit's headers, 20px on
Home and the Feed.
- ui/DataTable mounted its table AND its card list at every width, one
hidden by CSS: double DOM and render cost, duplicate ids, two keyboard
copies of every row. It now mounts the one the `md` media query calls for
(lib/useMediaQuery); the keyboard test asserts one layout at each width.
- The Plex module's content width went px → rem with the rest of the page.
peter
6fda49369f