Separator for use inside cngx-popover-panel (or a bare [cngxPopover]).
Composes CngxDivider via hostDirectives so the popover-context
separator carries proper role="separator" + aria-orientation
semantics without the consumer having to remember the ARIA wiring.
The orientation and inset inputs forward to the underlying
CngxDivider host directive.
Project anywhere inside the panel content - typically between menu
item groups (destructive vs non-destructive), between body sections,
or between footer action groups.