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__/edit-player-character.test.ts

@@ -0,0 +1,117 @@
+import { describe, expect, it } from "vitest";
+import { editPlayerCharacter } from "../edit-player-character.js";
+import type { PlayerCharacter } from "../player-character-types.js";
+import { playerCharacterId } from "../player-character-types.js";
+import { isDomainError } from "../types.js";
+
+const id = playerCharacterId("pc-1");
+
+function makePC(overrides?: Partial<PlayerCharacter>): PlayerCharacter {
+	return {
+		id,
+		name: "Aragorn",
+		ac: 16,
+		maxHp: 120,
+		color: "green",
+		icon: "sword",
+		...overrides,
+	};
+}
+
+describe("editPlayerCharacter", () => {
+	it("edits name successfully", () => {
+		const result = editPlayerCharacter([makePC()], id, { name: "Strider" });
+		if (isDomainError(result)) throw new Error(result.message);
+		expect(result.characters[0].name).toBe("Strider");
+		expect(result.events[0].type).toBe("PlayerCharacterUpdated");
+	});
+
+	it("edits multiple fields", () => {
+		const result = editPlayerCharacter([makePC()], id, {
+			name: "Strider",
+			ac: 18,
+		});
+		if (isDomainError(result)) throw new Error(result.message);
+		expect(result.characters[0].name).toBe("Strider");
+		expect(result.characters[0].ac).toBe(18);
+	});
+
+	it("returns error for not-found id", () => {
+		const result = editPlayerCharacter(
+			[makePC()],
+			playerCharacterId("pc-999"),
+			{ name: "Nope" },
+		);
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("player-character-not-found");
+		}
+	});
+
+	it("rejects empty name", () => {
+		const result = editPlayerCharacter([makePC()], id, { name: "" });
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("invalid-name");
+		}
+	});
+
+	it("rejects invalid AC", () => {
+		const result = editPlayerCharacter([makePC()], id, { ac: -1 });
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("invalid-ac");
+		}
+	});
+
+	it("rejects invalid maxHp", () => {
+		const result = editPlayerCharacter([makePC()], id, { maxHp: 0 });
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("invalid-max-hp");
+		}
+	});
+
+	it("rejects invalid color", () => {
+		const result = editPlayerCharacter([makePC()], id, { color: "neon" });
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("invalid-color");
+		}
+	});
+
+	it("rejects invalid icon", () => {
+		const result = editPlayerCharacter([makePC()], id, { icon: "banana" });
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("invalid-icon");
+		}
+	});
+
+	it("returns error when no fields changed", () => {
+		const pc = makePC();
+		const result = editPlayerCharacter([pc], id, {
+			name: pc.name,
+			ac: pc.ac,
+		});
+		expect(isDomainError(result)).toBe(true);
+		if (isDomainError(result)) {
+			expect(result.code).toBe("no-changes");
+		}
+	});
+
+	it("emits exactly one event on success", () => {
+		const result = editPlayerCharacter([makePC()], id, { name: "Strider" });
+		if (isDomainError(result)) throw new Error(result.message);
+		expect(result.events).toHaveLength(1);
+	});
+
+	it("event includes old and new name", () => {
+		const result = editPlayerCharacter([makePC()], id, { name: "Strider" });
+		if (isDomainError(result)) throw new Error(result.message);
+		const event = result.events[0];
+		if (event.type !== "PlayerCharacterUpdated") throw new Error("wrong event");
+		expect(event.oldName).toBe("Aragorn");
+		expect(event.newName).toBe("Strider");
+	});
+});