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/components/source-manager.tsx

@@ -6,13 +6,14 @@ import {
 	useOptimistic,
 	useState,
 } from "react";
-import type { CachedSourceInfo } from "../adapters/bestiary-cache.js";
-import * as bestiaryCache from "../adapters/bestiary-cache.js";
+import type { CachedSourceInfo } from "../adapters/ports.js";
+import { useAdapters } from "../contexts/adapter-context.js";
 import { useBestiaryContext } from "../contexts/bestiary-context.js";
 import { Button } from "./ui/button.js";
 import { Input } from "./ui/input.js";
 
 export function SourceManager() {
+	const { bestiaryCache } = useAdapters();
 	const { refreshCache } = useBestiaryContext();
 	const [sources, setSources] = useState<CachedSourceInfo[]>([]);
 	const [filter, setFilter] = useState("");
@@ -30,7 +31,7 @@ export function SourceManager() {
 	const loadSources = useCallback(async () => {
 		const cached = await bestiaryCache.getCachedSources();
 		setSources(cached);
-	}, []);
+	}, [bestiaryCache]);
 
 	useEffect(() => {
 		void loadSources();