Single‑key shortcuts (e.g., `?` for help, `h` for home) should not trigger when the user is typing in an input, textarea, or contenteditable. Manually checking the focused element is repetitive.
registerHotkey(key, callback) attaches a global listener that automatically ignores the event if focus is inside a form field.
Returns a cleanup function.
HelpDialog, QuickActions, SearchFocus, CommandPalette, SidebarShortcut