The ⌘K / Ctrl+K command palette, mounted once inside the dashboard's
shared app layout so it's available from every page. A debounced search
(2+ characters) fans out to
HawkEx.Billing.search_subscriptions/2, HawkEx.Audit.search/2, and
HawkEx.CSV.search_exports/2, showing up to 4 results from each.
Opened and closed by the CommandPalette JS hook
(assets/js/hooks/command_palette.js): ⌘K/Ctrl+K opens it, Esc
closes it.