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/domain/src/__tests__/delete-player-character.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it } from "vitest";
+import { deletePlayerCharacter } from "../delete-player-character.js";
+import type { PlayerCharacter } from "../player-character-types.js";
+import { playerCharacterId } from "../player-character-types.js";
+import { isDomainError } from "../types.js";
+
+const id1 = playerCharacterId("pc-1");
+const id2 = playerCharacterId("pc-2");
+
+function makePC(overrides?: Partial<PlayerCharacter>): PlayerCharacter {
+	return {
+		id: id1,
+		name: "Aragorn",
+		ac: 16,
+		maxHp: 120,
+		color: "green",
+		icon: "sword",
+		...overrides,
+	};
+}
+
+describe("deletePlayerCharacter", () => {
+	it("deletes an existing character", () => {
+		const result = deletePlayerCharacter([makePC()], id1);
+		if (isDomainError(result)) throw new Error(result.message);
+		expect(result.characters).toHaveLength(0);
+	});
+
+	it("returns error for not-found id", () => {
+		const result = deletePlayerCharacter([makePC()], id2);
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("player-character-not-found");
+		}
+	});
+
+	it("emits PlayerCharacterDeleted event", () => {
+		const result = deletePlayerCharacter([makePC()], id1);
+		if (isDomainError(result)) throw new Error(result.message);
+		expect(result.events).toHaveLength(1);
+		expect(result.events[0].type).toBe("PlayerCharacterDeleted");
+	});
+
+	it("preserves other characters when deleting one", () => {
+		const pc1 = makePC({ id: id1, name: "Aragorn" });
+		const pc2 = makePC({ id: id2, name: "Legolas" });
+		const result = deletePlayerCharacter([pc1, pc2], id1);
+		if (isDomainError(result)) throw new Error(result.message);
+		expect(result.characters).toHaveLength(1);
+		expect(result.characters[0].name).toBe("Legolas");
+	});
+
+	it("event includes deleted character name", () => {
+		const result = deletePlayerCharacter([makePC()], id1);
+		if (isDomainError(result)) throw new Error(result.message);
+		const event = result.events[0];
+		if (event.type !== "PlayerCharacterDeleted") throw new Error("wrong event");
+		expect(event.name).toBe("Aragorn");
+	});
+});