Add player character management feature

Persistent player character templates (name, AC, HP, color, icon) with
full CRUD, bestiary-style search to add PCs to encounters with pre-filled
stats, and color/icon visual distinction in combatant rows. Also stops
the stat block panel from auto-opening when adding a creature.

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

packages/application/src/create-player-character-use-case.ts

@@ -0,0 +1,36 @@
+import {
+	createPlayerCharacter,
+	type DomainError,
+	type DomainEvent,
+	isDomainError,
+	type PlayerCharacterId,
+} from "@initiative/domain";
+import type { PlayerCharacterStore } from "./ports.js";
+
+export function createPlayerCharacterUseCase(
+	store: PlayerCharacterStore,
+	id: PlayerCharacterId,
+	name: string,
+	ac: number,
+	maxHp: number,
+	color: string,
+	icon: string,
+): DomainEvent[] | DomainError {
+	const characters = store.getAll();
+	const result = createPlayerCharacter(
+		characters,
+		id,
+		name,
+		ac,
+		maxHp,
+		color,
+		icon,
+	);
+
+	if (isDomainError(result)) {
+		return result;
+	}
+
+	store.save([...result.characters]);
+	return result.events;
+}