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/delete-player-character.ts

@@ -0,0 +1,39 @@
+import type { DomainEvent } from "./events.js";
+import type {
+	PlayerCharacter,
+	PlayerCharacterId,
+} from "./player-character-types.js";
+import type { DomainError } from "./types.js";
+
+export interface DeletePlayerCharacterSuccess {
+	readonly characters: readonly PlayerCharacter[];
+	readonly events: DomainEvent[];
+}
+
+export function deletePlayerCharacter(
+	characters: readonly PlayerCharacter[],
+	id: PlayerCharacterId,
+): DeletePlayerCharacterSuccess | DomainError {
+	const index = characters.findIndex((c) => c.id === id);
+	if (index === -1) {
+		return {
+			kind: "domain-error",
+			code: "player-character-not-found",
+			message: `Player character not found: ${id}`,
+		};
+	}
+
+	const removed = characters[index];
+	const newList = characters.filter((_, i) => i !== index);
+
+	return {
+		characters: newList,
+		events: [
+			{
+				type: "PlayerCharacterDeleted",
+				playerCharacterId: id,
+				name: removed.name,
+			},
+		],
+	};
+}