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>

apps/web/src/hooks/use-player-characters.ts

@@ -0,0 +1,102 @@
+import type { PlayerCharacterStore } from "@initiative/application";
+import {
+	createPlayerCharacterUseCase,
+	deletePlayerCharacterUseCase,
+	editPlayerCharacterUseCase,
+} from "@initiative/application";
+import type { PlayerCharacter, PlayerCharacterId } from "@initiative/domain";
+import { isDomainError, playerCharacterId } from "@initiative/domain";
+import { useCallback, useEffect, useRef, useState } from "react";
+import {
+	loadPlayerCharacters,
+	savePlayerCharacters,
+} from "../persistence/player-character-storage.js";
+
+function initializeCharacters(): PlayerCharacter[] {
+	return loadPlayerCharacters();
+}
+
+let nextPcId = 0;
+
+function generatePcId(): PlayerCharacterId {
+	return playerCharacterId(`pc-${++nextPcId}`);
+}
+
+interface EditFields {
+	readonly name?: string;
+	readonly ac?: number;
+	readonly maxHp?: number;
+	readonly color?: string;
+	readonly icon?: string;
+}
+
+export function usePlayerCharacters() {
+	const [characters, setCharacters] =
+		useState<PlayerCharacter[]>(initializeCharacters);
+	const charactersRef = useRef(characters);
+	charactersRef.current = characters;
+
+	useEffect(() => {
+		savePlayerCharacters(characters);
+	}, [characters]);
+
+	const makeStore = useCallback((): PlayerCharacterStore => {
+		return {
+			getAll: () => charactersRef.current,
+			save: (updated) => {
+				charactersRef.current = updated;
+				setCharacters(updated);
+			},
+		};
+	}, []);
+
+	const createCharacter = useCallback(
+		(name: string, ac: number, maxHp: number, color: string, icon: string) => {
+			const id = generatePcId();
+			const result = createPlayerCharacterUseCase(
+				makeStore(),
+				id,
+				name,
+				ac,
+				maxHp,
+				color,
+				icon,
+			);
+			if (isDomainError(result)) {
+				return result;
+			}
+			return undefined;
+		},
+		[makeStore],
+	);
+
+	const editCharacter = useCallback(
+		(id: PlayerCharacterId, fields: EditFields) => {
+			const result = editPlayerCharacterUseCase(makeStore(), id, fields);
+			if (isDomainError(result)) {
+				return result;
+			}
+			return undefined;
+		},
+		[makeStore],
+	);
+
+	const deleteCharacter = useCallback(
+		(id: PlayerCharacterId) => {
+			const result = deletePlayerCharacterUseCase(makeStore(), id);
+			if (isDomainError(result)) {
+				return result;
+			}
+			return undefined;
+		},
+		[makeStore],
+	);
+
+	return {
+		characters,
+		createCharacter,
+		editCharacter,
+		deleteCharacter,
+		makeStore,
+	} as const;
+}