Mirrors hidePlayerHp. New hideNpcHp flag on activeDisplay doc.
- AdminView: 'Hide NPC/monster HP' switch in Player Display settings.
- DisplayView: HP bar gated by !(hideNpcHp && p.type !== 'character').
Covers monsters + NPCs (all non-player).
- Default false (show NPC HP) — opposite of player HP default true.
updateDoc patch (BUG-4 pattern). No clobber.
Test: HideHpToggle selector scoped to 'hide player hp' (now 2 switches).