Implement the 016-combatant-ac feature that adds an optional Armor Class field to combatants with shield icon display and inline editing in the encounter tracker

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/hooks/use-encounter.ts

@@ -6,6 +6,7 @@ import {
 	editCombatantUseCase,
 	removeCombatantUseCase,
 	retreatTurnUseCase,
+	setAcUseCase,
 	setHpUseCase,
 	setInitiativeUseCase,
 } from "@initiative/application";
@@ -171,6 +172,19 @@ export function useEncounter() {
 		[makeStore],
 	);
 
+	const setAc = useCallback(
+		(id: CombatantId, value: number | undefined) => {
+			const result = setAcUseCase(makeStore(), id, value);
+
+			if (isDomainError(result)) {
+				return;
+			}
+
+			setEvents((prev) => [...prev, ...result]);
+		},
+		[makeStore],
+	);
+
 	return {
 		encounter,
 		events,
@@ -182,5 +196,6 @@ export function useEncounter() {
 		setInitiative,
 		setHp,
 		adjustHp,
+		setAc,
 	} as const;
 }