CngxTagGroupSlotContext

Shared context exposed by the two CngxTagGroup slots (*cngxTagGroupHeader, *cngxTagGroupAccessory) - the full reactive group state plus the live count of projected CngxTag children. Lets consumer headers render "Filters ({{ count }})" without injecting the group.

$implicit is void because the slots have no positional payload - consumers reach for the named fields below.

The per-slot names below alias this interface. A slot that grows its own field (e.g. position on accessory) forks its alias back into an interface extending this one - sibling consumers stay source-compatible either way.