R66 A1-A6：小团队试点收敛与上线验收

server/tests/unit/routes/portal.test.js

@@ -328,6 +328,8 @@ async function buildApp(options = {}) {
 
 describe("portal routes", () => {
   beforeEach(() => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-04-12T02:00:00.000Z"));
     featureFlagState.portalHome = true;
     featureFlagState.announcements = false;
     featureFlagState.presenceBoard = false;
@@ -342,6 +344,10 @@ describe("portal routes", () => {
     buildTeamPresenceSummary.mockClear();
   });
 
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
   it("extends /portal/home with normalized recentActivities and teamStatusBoard", async () => {
     const recentWorkflowRows = Array.from({ length: 8 }, (_, index) =>
       buildWorkflowRow({