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/persistence/encounter-storage.ts

@@ -48,6 +48,13 @@ export function loadEncounter(): Encounter | null {
 					typeof entry.initiative === "number" ? entry.initiative : undefined,
 			};
 
+			// Validate AC field
+			const ac = entry.ac;
+			const validAc =
+				typeof ac === "number" && Number.isInteger(ac) && ac >= 0
+					? ac
+					: undefined;
+
 			// Validate and attach HP fields if valid
 			const maxHp = entry.maxHp;
 			const currentHp = entry.currentHp;
@@ -59,12 +66,13 @@ export function loadEncounter(): Encounter | null {
 					currentHp <= maxHp;
 				return {
 					...base,
+					ac: validAc,
 					maxHp,
 					currentHp: validCurrentHp ? currentHp : maxHp,
 				};
 			}
 
-			return base;
+			return { ...base, ac: validAc };
 		});
 
 		const result = createEncounter(