test(dashboard): align PR-reviews/PR-merged tests with current signatures

- routes-pr-reviews mock store now provides updatePrInfoByNumber and
  addPrInfo (refresh route uses both for the multi-PR refresh path).
- pr-merged-auto-done.integration calls store.init() and passes
  refreshPrInBackground a PrInfo[] array (the signature changed when
  multi-PR support landed).

Fixes 2 failing tests.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/dashboard/src/__tests__/pr-merged-auto-done.integration.test.ts

@@ -38,6 +38,7 @@ describe("pr merged refresh auto-done", () => {
     rootDir = mkdtempSync(join(tmpdir(), "fn-4762-pr-merged-root-"));
     globalDir = mkdtempSync(join(tmpdir(), "fn-4762-pr-merged-global-"));
     store = new TaskStore(rootDir, globalDir, { inMemoryDb: true });
+    await store.init();
   });
 
   afterEach(() => {
@@ -60,7 +61,7 @@ describe("pr merged refresh auto-done", () => {
       commentCount: 0,
     });
 
-    await refreshPrInBackground(store, task.id, (await store.getTask(task.id)).prInfo!);
+    await refreshPrInBackground(store, task.id, [(await store.getTask(task.id)).prInfo!]);
 
     const updated = await store.getTask(task.id);
     expect(updated.column).toBe("done");

packages/dashboard/src/__tests__/routes-pr-reviews.test.ts

@@ -34,6 +34,8 @@ function createStore(task: Task): TaskStore {
   return {
     getTask: vi.fn().mockResolvedValue(task),
     updatePrInfo: vi.fn().mockResolvedValue(undefined),
+    updatePrInfoByNumber: vi.fn().mockResolvedValue(undefined),
+    addPrInfo: vi.fn().mockResolvedValue(undefined),
     addComment: vi.fn().mockResolvedValue(task),
     moveTask: vi.fn().mockResolvedValue({ ...task, column: "todo" }),
     upsertTaskDocument: vi.fn().mockResolvedValue({ key: "review-feedback" }),