Expand description
Host-side applier for the *dashboard* launch page (DB.2).
lattice-dashboard owns the section registry, the fragment content
contract, the dashboard-mode major, and the config. The host owns what a
crate cannot: buffer creation (mutates &mut Editor) and the fragment →
HelpContent conversion (the host owns the help machinery). :dashboard
and the startup trigger (DB.5) both route through Effect::OpenDashboard
to Editor::do_open_dashboard — the sanctioned lifecycle boundary,
mirroring :messages→do_open_messages.
See docs/dev/architecture/dashboard.md §9.