toggle() was set(!collapsed), and while nothing is stored `collapsed`
is only `rail.default`: an adaptive rail between 840 and 1199px is
drawn collapsed whatever that says, so an application's shortcut
collapsed a collapsed rail and the first press changed nothing. Each
interactive rail now registers its root, and toggle() asks the first
one on the page, the way its menu button asks itself: an open rail is
hidden, a rail with no room to expand (modal, or adaptive below
expanded) opens over its scrim without storing anything, and any
other rail stores the opposite of what it draws, so a rail that hid
itself docks back into the layout as before. With no rail on the
page it still flips the choice. collapse() and expand() stay the
choice itself. The browser tests toggle the scaffold's rail at 960
and 1512px (in place) and at 768 and 393px (the modal), and a hiding
rail back into the layout; the first two fail without the change.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
