feat(viewer): waterfall feed with lazy load, filter and new-photo hint

Co-Authored-By: Claude Code <noreply@anthropic.com>

apps/viewer/src/__tests__/activity.spec.ts

@@ -8,11 +8,16 @@ import ActivityPage from '../pages/ActivityPage.vue';
 import { router } from '../router';
 import { makeAlbum, makeEnAlbum } from './fixtures';
 
-// ActivityPage（Task 6）组件测试：api client 以真实模块为底、仅替身 getPublicAlbum，
+// ActivityPage（Task 6）组件测试：api client 以真实模块为底、仅替身 getPublicAlbum /
+// getPublicPhotos（Task 7 起活动页内嵌 PhotoFeed，需喂空页避免真实 fetch），
 // 保证 ApiError/errors 映射等真实逻辑参与断言。
 vi.mock('../api/client', async (importOriginal) => {
   const actual = await importOriginal<typeof import('../api/client')>();
-  return { ...actual, getPublicAlbum: vi.fn() };
+  return {
+    ...actual,
+    getPublicAlbum: vi.fn(),
+    getPublicPhotos: vi.fn().mockResolvedValue({ items: [], nextCursor: null, hasMore: false }),
+  };
 });
 
 const mockedGetPublicAlbum = vi.mocked(getPublicAlbum);
@@ -63,8 +68,8 @@ describe('activity page (Task 6)', () => {
     expect(wrapper.find('.meta').text()).toContain('10月1日');
 
     const chips = wrapper.findAll('.chip');
-    expect(chips.map((chip) => chip.text())).toEqual(['签到墙', '开场']);
-    expect(chips.every((chip) => chip.attributes('disabled') !== undefined)).toBe(true);
+    expect(chips.map((chip) => chip.text())).toEqual(['全部', '签到墙', '开场']);
+    expect(chips.every((chip) => chip.attributes('disabled') === undefined)).toBe(true);
 
     expect(wrapper.find('.empty-notice').text()).toBe('照片即将上线');
     // 无 banner 资产 → 不渲染 img；viewCount 占位 null → 不渲染任何计数节点。