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/use-bestiary.ts

@@ -8,11 +8,7 @@ import {
 	normalizeBestiary,
 	setSourceDisplayNames,
 } from "../adapters/bestiary-adapter.js";
-import * as bestiaryCache from "../adapters/bestiary-cache.js";
-import {
-	getSourceDisplayName,
-	loadBestiaryIndex,
-} from "../adapters/bestiary-index-adapter.js";
+import { useAdapters } from "../contexts/adapter-context.js";
 
 export interface SearchResult extends BestiaryIndexEntry {
 	readonly sourceDisplayName: string;
@@ -32,13 +28,14 @@ interface BestiaryHook {
 }
 
 export function useBestiary(): BestiaryHook {
+	const { bestiaryCache, bestiaryIndex } = useAdapters();
 	const [isLoaded, setIsLoaded] = useState(false);
 	const [creatureMap, setCreatureMap] = useState(
 		() => new Map<CreatureId, Creature>(),
 	);
 
 	useEffect(() => {
-		const index = loadBestiaryIndex();
+		const index = bestiaryIndex.loadIndex();
 		setSourceDisplayNames(index.sources as Record<string, string>);
 		if (index.creatures.length > 0) {
 			setIsLoaded(true);
@@ -47,21 +44,24 @@ export function useBestiary(): BestiaryHook {
 		void bestiaryCache.loadAllCachedCreatures().then((map) => {
 			setCreatureMap(map);
 		});
-	}, []);
+	}, [bestiaryCache, bestiaryIndex]);
 
-	const search = useCallback((query: string): SearchResult[] => {
-		if (query.length < 2) return [];
-		const lower = query.toLowerCase();
-		const index = loadBestiaryIndex();
-		return index.creatures
-			.filter((c) => c.name.toLowerCase().includes(lower))
-			.sort((a, b) => a.name.localeCompare(b.name))
-			.slice(0, 10)
-			.map((c) => ({
-				...c,
-				sourceDisplayName: getSourceDisplayName(c.source),
-			}));
-	}, []);
+	const search = useCallback(
+		(query: string): SearchResult[] => {
+			if (query.length < 2) return [];
+			const lower = query.toLowerCase();
+			const index = bestiaryIndex.loadIndex();
+			return index.creatures
+				.filter((c) => c.name.toLowerCase().includes(lower))
+				.sort((a, b) => a.name.localeCompare(b.name))
+				.slice(0, 10)
+				.map((c) => ({
+					...c,
+					sourceDisplayName: bestiaryIndex.getSourceDisplayName(c.source),
+				}));
+		},
+		[bestiaryIndex],
+	);
 
 	const getCreature = useCallback(
 		(id: CreatureId): Creature | undefined => {
@@ -74,7 +74,7 @@ export function useBestiary(): BestiaryHook {
 		(sourceCode: string): Promise<boolean> => {
 			return bestiaryCache.isSourceCached(sourceCode);
 		},
-		[],
+		[bestiaryCache],
 	);
 
 	const fetchAndCacheSource = useCallback(
@@ -87,7 +87,7 @@ export function useBestiary(): BestiaryHook {
 			}
 			const json = await response.json();
 			const creatures = normalizeBestiary(json);
-			const displayName = getSourceDisplayName(sourceCode);
+			const displayName = bestiaryIndex.getSourceDisplayName(sourceCode);
 			await bestiaryCache.cacheSource(sourceCode, displayName, creatures);
 			setCreatureMap((prev) => {
 				const next = new Map(prev);
@@ -97,14 +97,14 @@ export function useBestiary(): BestiaryHook {
 				return next;
 			});
 		},
-		[],
+		[bestiaryCache, bestiaryIndex],
 	);
 
 	const uploadAndCacheSource = useCallback(
 		async (sourceCode: string, jsonData: unknown): Promise<void> => {
 			// biome-ignore lint/suspicious/noExplicitAny: raw JSON shape varies
 			const creatures = normalizeBestiary(jsonData as any);
-			const displayName = getSourceDisplayName(sourceCode);
+			const displayName = bestiaryIndex.getSourceDisplayName(sourceCode);
 			await bestiaryCache.cacheSource(sourceCode, displayName, creatures);
 			setCreatureMap((prev) => {
 				const next = new Map(prev);
@@ -114,13 +114,13 @@ export function useBestiary(): BestiaryHook {
 				return next;
 			});
 		},
-		[],
+		[bestiaryCache, bestiaryIndex],
 	);
 
 	const refreshCache = useCallback(async (): Promise<void> => {
 		const map = await bestiaryCache.loadAllCachedCreatures();
 		setCreatureMap(map);
-	}, []);
+	}, [bestiaryCache]);
 
 	return {
 		search,