C2 as decided: on a coarse pointer, or a window below 768, the panel's
tab (shown at every width, 44 wide on touch) opens the panel as a
start-edge drawer over the content, with a scrim. It is ui/Modal's new
drawer-start placement, so Esc, Back, the scrim, the focus trap and the
scroll lock are the dialog's own. A tap never peeks; pinning is a button
in the drawer's header, offered only at 1024 and up; a pin saved on a
desktop is left alone below that. A mouse on a wide window keeps
hover-to-peek and click-to-pin.
DESIGN: C2 as built, rows answer to their own width, phone-only layout
deferred to its own epic (principle 2).
peter
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