Implement the 009-combatant-hp feature that adds optional max HP and current HP tracking per combatant with +/- controls, direct entry, and persistence

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

apps/web/src/persistence/encounter-storage.ts

@@ -41,12 +41,30 @@ export function loadEncounter(): Encounter | null {
 
 		const rehydrated = combatants.map((c) => {
 			const entry = c as Record<string, unknown>;
-			return {
+			const base = {
 				id: combatantId(entry.id as string),
 				name: entry.name as string,
 				initiative:
 					typeof entry.initiative === "number" ? entry.initiative : undefined,
 			};
+
+			// Validate and attach HP fields if valid
+			const maxHp = entry.maxHp;
+			const currentHp = entry.currentHp;
+			if (typeof maxHp === "number" && Number.isInteger(maxHp) && maxHp >= 1) {
+				const validCurrentHp =
+					typeof currentHp === "number" &&
+					Number.isInteger(currentHp) &&
+					currentHp >= 0 &&
+					currentHp <= maxHp;
+				return {
+					...base,
+					maxHp,
+					currentHp: validCurrentHp ? currentHp : maxHp,
+				};
+			}
+
+			return base;
 		});
 
 		const result = createEncounter(