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/adapters/__tests__/bestiary-index-adapter.test.ts

@@ -0,0 +1,107 @@
+import { describe, expect, it } from "vitest";
+import {
+	getAllSourceCodes,
+	getDefaultFetchUrl,
+	getSourceDisplayName,
+	loadBestiaryIndex,
+} from "../bestiary-index-adapter.js";
+
+describe("loadBestiaryIndex", () => {
+	it("returns an object with sources and creatures", () => {
+		const index = loadBestiaryIndex();
+		expect(index.sources).toBeDefined();
+		expect(index.creatures).toBeDefined();
+		expect(Array.isArray(index.creatures)).toBe(true);
+	});
+
+	it("creatures have the expected shape", () => {
+		const index = loadBestiaryIndex();
+		expect(index.creatures.length).toBeGreaterThan(0);
+		const first = index.creatures[0];
+		expect(first).toHaveProperty("name");
+		expect(first).toHaveProperty("source");
+		expect(first).toHaveProperty("ac");
+		expect(first).toHaveProperty("hp");
+		expect(first).toHaveProperty("dex");
+		expect(first).toHaveProperty("cr");
+		expect(first).toHaveProperty("initiativeProficiency");
+		expect(first).toHaveProperty("size");
+		expect(first).toHaveProperty("type");
+	});
+
+	it("returns the same cached instance on subsequent calls", () => {
+		const a = loadBestiaryIndex();
+		const b = loadBestiaryIndex();
+		expect(a).toBe(b);
+	});
+
+	it("sources is a record of source code to display name", () => {
+		const index = loadBestiaryIndex();
+		const entries = Object.entries(index.sources);
+		expect(entries.length).toBeGreaterThan(0);
+		for (const [code, name] of entries) {
+			expect(typeof code).toBe("string");
+			expect(typeof name).toBe("string");
+			expect(code.length).toBeGreaterThan(0);
+			expect(name.length).toBeGreaterThan(0);
+		}
+	});
+});
+
+describe("getAllSourceCodes", () => {
+	it("returns all keys from the index sources", () => {
+		const codes = getAllSourceCodes();
+		const index = loadBestiaryIndex();
+		expect(codes).toEqual(Object.keys(index.sources));
+	});
+
+	it("returns only strings", () => {
+		for (const code of getAllSourceCodes()) {
+			expect(typeof code).toBe("string");
+		}
+	});
+});
+
+describe("getDefaultFetchUrl", () => {
+	it("returns default GitHub URL when no baseUrl provided", () => {
+		const url = getDefaultFetchUrl("MM");
+		expect(url).toBe(
+			"https://raw.githubusercontent.com/5etools-mirror-3/5etools-src/main/data/bestiary/bestiary-mm.json",
+		);
+	});
+
+	it("constructs URL from baseUrl with trailing slash", () => {
+		const url = getDefaultFetchUrl("PHB", "https://example.com/data/");
+		expect(url).toBe("https://example.com/data/bestiary-phb.json");
+	});
+
+	it("normalizes baseUrl without trailing slash", () => {
+		const url = getDefaultFetchUrl("PHB", "https://example.com/data");
+		expect(url).toBe("https://example.com/data/bestiary-phb.json");
+	});
+
+	it("lowercases the source code in the filename", () => {
+		const url = getDefaultFetchUrl("XMM");
+		expect(url).toContain("bestiary-xmm.json");
+	});
+
+	it("applies filename override for Plane Shift sources", () => {
+		expect(getDefaultFetchUrl("PSA")).toContain("bestiary-ps-a.json");
+		expect(getDefaultFetchUrl("PSD")).toContain("bestiary-ps-d.json");
+		expect(getDefaultFetchUrl("PSK")).toContain("bestiary-ps-k.json");
+	});
+});
+
+describe("getSourceDisplayName", () => {
+	it("returns display name for a known source", () => {
+		const index = loadBestiaryIndex();
+		const [code, expectedName] = Object.entries(index.sources)[0];
+		expect(getSourceDisplayName(code)).toBe(expectedName);
+	});
+
+	it("falls back to source code for unknown source", () => {
+		expect(getSourceDisplayName("UNKNOWN_SOURCE_XYZ")).toBe(
+			"UNKNOWN_SOURCE_XYZ",
+		);
+	});
+});