Introduce adapter injection and migrate test suite

Replace direct adapter/persistence imports with context-based injection
(AdapterContext + useAdapters) so tests use in-memory implementations
instead of vi.mock. Migrate component tests from context mocking to
AllProviders with real hooks. Extract export/import logic from ActionBar
into useEncounterExportImport hook. Add bestiary-cache and
bestiary-index-adapter test suites. Raise adapter coverage thresholds
(68→80 lines, 56→62 branches).

77 test files, 891 tests, all passing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/src/hooks/__tests__/use-player-characters.test.tsx

@@ -0,0 +1,137 @@
+// @vitest-environment jsdom
+import { playerCharacterId } from "@initiative/domain";
+import { act, renderHook } from "@testing-library/react";
+import type { ReactNode } from "react";
+import { beforeAll, describe, expect, it, vi } from "vitest";
+import { createTestAdapters } from "../../__tests__/adapters/in-memory-adapters.js";
+import { AllProviders } from "../../__tests__/test-providers.js";
+import { usePlayerCharacters } from "../use-player-characters.js";
+
+beforeAll(() => {
+	Object.defineProperty(globalThis, "matchMedia", {
+		writable: true,
+		value: vi.fn().mockImplementation((query: string) => ({
+			matches: false,
+			media: query,
+			onchange: null,
+			addListener: vi.fn(),
+			removeListener: vi.fn(),
+			addEventListener: vi.fn(),
+			removeEventListener: vi.fn(),
+			dispatchEvent: vi.fn(),
+		})),
+	});
+});
+
+function wrapper({ children }: { children: ReactNode }) {
+	return <AllProviders>{children}</AllProviders>;
+}
+
+describe("usePlayerCharacters", () => {
+	it("initializes with characters from persistence", () => {
+		const stored = [
+			{
+				id: playerCharacterId("pc-1"),
+				name: "Aria",
+				ac: 16,
+				maxHp: 30,
+				color: undefined,
+				icon: undefined,
+			},
+		];
+		const adapters = createTestAdapters({ playerCharacters: stored });
+
+		const { result } = renderHook(() => usePlayerCharacters(), {
+			wrapper: ({ children }: { children: ReactNode }) => (
+				<AllProviders adapters={adapters}>{children}</AllProviders>
+			),
+		});
+
+		expect(result.current.characters).toEqual(stored);
+	});
+
+	it("createCharacter adds a character and persists", () => {
+		const { result } = renderHook(() => usePlayerCharacters(), { wrapper });
+
+		act(() => {
+			result.current.createCharacter(
+				"Vex",
+				15,
+				28,
+				undefined,
+				undefined,
+				undefined,
+			);
+		});
+
+		expect(result.current.characters).toHaveLength(1);
+		expect(result.current.characters[0].name).toBe("Vex");
+		expect(result.current.characters[0].ac).toBe(15);
+		expect(result.current.characters[0].maxHp).toBe(28);
+	});
+
+	it("createCharacter returns domain error for empty name", () => {
+		const { result } = renderHook(() => usePlayerCharacters(), { wrapper });
+
+		let error: unknown;
+		act(() => {
+			error = result.current.createCharacter(
+				"",
+				15,
+				28,
+				undefined,
+				undefined,
+				undefined,
+			);
+		});
+
+		expect(error).toMatchObject({ kind: "domain-error" });
+		expect(result.current.characters).toHaveLength(0);
+	});
+
+	it("editCharacter updates character and persists", () => {
+		const { result } = renderHook(() => usePlayerCharacters(), { wrapper });
+
+		act(() => {
+			result.current.createCharacter(
+				"Vex",
+				15,
+				28,
+				undefined,
+				undefined,
+				undefined,
+			);
+		});
+
+		const id = result.current.characters[0].id;
+
+		act(() => {
+			result.current.editCharacter(id, { name: "Vex'ahlia" });
+		});
+
+		expect(result.current.characters[0].name).toBe("Vex'ahlia");
+	});
+
+	it("deleteCharacter removes character and persists", () => {
+		const { result } = renderHook(() => usePlayerCharacters(), { wrapper });
+
+		act(() => {
+			result.current.createCharacter(
+				"Vex",
+				15,
+				28,
+				undefined,
+				undefined,
+				undefined,
+			);
+		});
+
+		const id = result.current.characters[0].id;
+
+		act(() => {
+			result.current.deleteCharacter(id);
+		});
+
+		expect(result.current.characters).toHaveLength(0);
+	});
+});