pub const SIDEBAR_TOGGLE_ID: &str = "day::sidebar_toggle";Expand description
The reserved id of the sidebar affordance a nav(Sidebar) supplies for itself
(docs/toolbars.md). Backends with a system item for the job (AppKit’s
NSToolbarToggleSidebarItem) recognize it by this id and draw theirs instead; dayscript
recognizes it to drive the toolkit’s own duty rather than an app closure.