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-bulk-import.ts

@@ -1,8 +1,5 @@
 import { useCallback, useRef, useState } from "react";
-import {
-	getAllSourceCodes,
-	getDefaultFetchUrl,
-} from "../adapters/bestiary-index-adapter.js";
+import { useAdapters } from "../contexts/adapter-context.js";
 
 const BATCH_SIZE = 6;
 
@@ -32,6 +29,7 @@ interface BulkImportHook {
 }
 
 export function useBulkImport(): BulkImportHook {
+	const { bestiaryIndex } = useAdapters();
 	const [state, setState] = useState<BulkImportState>(IDLE_STATE);
 	const countersRef = useRef({ completed: 0, failed: 0 });
 
@@ -42,7 +40,7 @@ export function useBulkImport(): BulkImportHook {
 			isSourceCached: (sourceCode: string) => Promise<boolean>,
 			refreshCache: () => Promise<void>,
 		) => {
-			const allCodes = getAllSourceCodes();
+			const allCodes = bestiaryIndex.getAllSourceCodes();
 			const total = allCodes.length;
 
 			countersRef.current = { completed: 0, failed: 0 };
@@ -83,7 +81,7 @@ export function useBulkImport(): BulkImportHook {
 						chain.then(() =>
 							Promise.allSettled(
 								batch.map(async ({ code }) => {
-									const url = getDefaultFetchUrl(code, baseUrl);
+									const url = bestiaryIndex.getDefaultFetchUrl(code, baseUrl);
 									try {
 										await fetchAndCacheSource(code, url);
 										countersRef.current.completed++;
@@ -117,7 +115,7 @@ export function useBulkImport(): BulkImportHook {
 				});
 			})();
 		},
-		[],
+		[bestiaryIndex],
 	);
 
 	const reset = useCallback(() => {