feat(viewer): UI-02 heart particles, interaction notices, share and download

Task 5 (V05 §5.4/§6): decorative heart particles on the lightbox stage
(local like clicks + others' WS bursts for the current photo), compact
cross-photo interaction notices above the action bar (click to locate),
navigator.share-first share orchestration with clipboard fallback for
album and photo deep links (lang param), and download failures attributed
to the photo that triggered them. Self-echo dedup stays in the realtime
router (own batches never produce particles/notices); particles cap at
12 with visibility/unmount cleanup and are suppressed under reduced
motion; notices cap at 3 with ~4s auto-dismiss and throttled SR summary.

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

apps/viewer/src/__tests__/album-header.spec.ts

@@ -57,6 +57,7 @@ describe('album header info area (UI-02 V02)', () => {
     clientSpy?.mockRestore();
     clientSpy = null;
     Reflect.deleteProperty(navigator, 'clipboard');
+    Reflect.deleteProperty(navigator, 'share');
   });
 
   it('renders banner, title, multi-line description, Intl view count, venue and sort/category toolbar', () => {
@@ -179,22 +180,39 @@ describe('album header info area (UI-02 V02)', () => {
     expect(wrapper.emitted('selectCategory')).toEqual([['cat-open'], [null]]);
   });
 
-  it('share copies the album url to the clipboard and reports success; failure keeps a selectable url', async () => {
+  it('share falls back to the clipboard with the album url (lang param) and reports success; failure keeps a selectable url', async () => {
     const writeText = stubClipboard(() => Promise.resolve());
     const wrapper = mountHeader({ album: makeAlbum(), viewCount: null });
 
     await wrapper.find('.share-btn').trigger('click');
     await Promise.resolve();
-    expect(writeText).toHaveBeenCalledWith('http://localhost:3000/a/tokfixture0000000000aaaa');
+    expect(writeText).toHaveBeenCalledWith('http://localhost:3000/a/tokfixture0000000000aaaa?lang=zh-CN');
     expect(wrapper.find('.share-status').text()).toContain('链接已复制');
     expect(wrapper.find('.share-url').exists()).toBe(false);
 
-    // 复制失败：轻提示 + 可选中文本（§5.4 回退语义，完整 navigator.share 属 Task 5）。
+    // 复制失败：轻提示 + 可选中文本（§5.4 回退语义）。
     writeText.mockImplementation(() => Promise.reject(new Error('denied')));
     await wrapper.find('.share-btn').trigger('click');
     await Promise.resolve();
     await Promise.resolve();
     expect(wrapper.find('.share-status').text()).toContain('复制失败');
-    expect(wrapper.find('.share-url').text()).toBe('http://localhost:3000/a/tokfixture0000000000aaaa');
+    expect(wrapper.find('.share-url').text()).toBe('http://localhost:3000/a/tokfixture0000000000aaaa?lang=zh-CN');
+  });
+
+  it('share uses navigator.share with the album title when available and stays silent on success', async () => {
+    const share = vi.fn(() => Promise.resolve());
+    Object.defineProperty(navigator, 'share', { value: share, configurable: true });
+    const writeText = stubClipboard(() => Promise.resolve());
+    const wrapper = mountHeader({ album: makeAlbum(), viewCount: null });
+
+    await wrapper.find('.share-btn').trigger('click');
+    await Promise.resolve();
+    expect(share).toHaveBeenCalledWith({
+      title: '2026 公司年会',
+      url: 'http://localhost:3000/a/tokfixture0000000000aaaa?lang=zh-CN',
+    });
+    // 原生分享成功：无额外轻提示（面板已收尾，§5.4），也不落剪贴板。
+    expect(writeText).not.toHaveBeenCalled();
+    expect(wrapper.find('.share-status').exists()).toBe(false);
   });
 });

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

@@ -1,5 +1,5 @@
 import { flushPromises, mount, type VueWrapper } from '@vue/test-utils';
-import { defineComponent, ref } from 'vue';
+import { defineComponent, nextTick, ref } from 'vue';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 import {
   ApiError,
@@ -89,9 +89,10 @@ function spyWindowOpen() {
 }
 let openSpy: ReturnType<typeof spyWindowOpen>;
 
-/** 宿主实例形态：setup 暴露 albumRef（ref 经代理解包）+ download 控制器。 */
+/** 宿主实例形态：setup 暴露 albumRef/currentRef（ref 经代理解包）+ download 控制器。 */
 interface HostVm {
   albumRef: PublicAlbum | null;
+  currentRef: string;
   download: DownloadController;
 }
 
@@ -112,7 +113,7 @@ function mountLightbox(album: PublicAlbum): VueWrapper & { vm: HostVm } {
         album: () => albumRef.value,
         photoId: () => current.value,
       });
-      return { sequence, photoId: current, download, albumRef };
+      return { sequence, photoId: current, currentRef: current, download, albumRef };
     },
     template: `<PhotoLightbox v-model:photo-id="photoId" :sequence="sequence" :download="download" />`,
   });
@@ -251,6 +252,31 @@ describe('photo download (P4a Task 4)', () => {
     expect(openSpy).not.toHaveBeenCalled();
   });
 
+  it('attributes an async failure to the photo that triggered the download, not the current one', async () => {
+    // 在途请求挂起期间切图：错误归属触发时的 photoId（UI-02 §5.4）。
+    let rejectDownload!: (error: Error) => void;
+    mockedGetPhotoDownload.mockReset().mockImplementation(
+      () =>
+        new Promise((_resolve, reject) => {
+          rejectDownload = reject;
+        }),
+    );
+    const wrapper = mountLightbox(makeAlbum());
+    await flushPromises();
+
+    await wrapper.find('.download-main').trigger('click'); // p1 触发
+    wrapper.vm.currentRef = 'p2'; // 请求在途时切到 p2
+    rejectDownload(new Error('boom'));
+    await flushPromises();
+
+    expect(wrapper.vm.download.failedFor).toBe('p1');
+    expect(wrapper.find('.download-failed').exists()).toBe(false); // p2 不背锅
+
+    wrapper.vm.currentRef = 'p1'; // 切回 p1：错误提示可见
+    await nextTick();
+    expect(wrapper.find('.download-failed[role="alert"]').text()).toContain('下载失败');
+  });
+
   it('DOWNLOAD_DISABLED surfaces the dedicated localized notice (T15 漏译修复)', async () => {
     // 相册中途关闭下载开关（载荷仍开但端点 403）→ 专属文案而非通用失败。
     mockedGetPhotoDownload.mockReset().mockRejectedValue(

apps/viewer/src/__tests__/heart-particles.spec.ts

@@ -0,0 +1,100 @@
+import { mount, type VueWrapper } from '@vue/test-utils';
+import { nextTick } from 'vue';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import HeartParticles from '../components/viewer/HeartParticles.vue';
+import { setReducedMotion } from '../ui/prefs';
+
+// UI-02 V05 HeartParticles 单测（§6.2/§6.3）：burst 生成粒子上限 12（超限弃
+// 最旧）、动画时长后自清理、页面隐藏即清空、「减少动画」时不生成/开启即清空。
+// 粒子为纯装饰层（aria-hidden + pointer-events:none）。
+
+const mounted: VueWrapper[] = [];
+
+interface ParticlesExposed {
+  burst: (count: number) => void;
+}
+
+function mountParticles(): VueWrapper & { vm: ParticlesExposed } {
+  const wrapper = mount(HeartParticles);
+  mounted.push(wrapper);
+  return wrapper as VueWrapper & { vm: ParticlesExposed };
+}
+
+function setHidden(hidden: boolean): void {
+  Object.defineProperty(document, 'hidden', { value: hidden, configurable: true });
+  document.dispatchEvent(new Event('visibilitychange'));
+}
+
+describe('heart particles (UI-02 V05)', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    setReducedMotion(false);
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    while (mounted.length > 0) mounted.pop()?.unmount();
+    vi.useRealTimers();
+    setReducedMotion(false);
+    setHidden(false);
+  });
+
+  it('creates particles on burst and removes them after the float animation', async () => {
+    const wrapper = mountParticles();
+
+    wrapper.vm.burst(3);
+    await nextTick();
+    expect(wrapper.findAll('.heart-particles-zone .particle')).toHaveLength(3);
+
+    // 动画时长上限 1.8s + 收尾缓冲：之后自清理（不留冻结的过期粒子）。
+    await vi.advanceTimersByTimeAsync(2000);
+    expect(wrapper.findAll('.particle')).toHaveLength(0);
+  });
+
+  it('caps concurrent particles at 12, dropping the oldest', async () => {
+    const wrapper = mountParticles();
+
+    wrapper.vm.burst(10);
+    await nextTick();
+    expect(wrapper.findAll('.particle')).toHaveLength(10);
+
+    wrapper.vm.burst(5);
+    await nextTick();
+    expect(wrapper.findAll('.particle')).toHaveLength(12);
+  });
+
+  it('clears particles and timers when the page becomes hidden', async () => {
+    const wrapper = mountParticles();
+
+    wrapper.vm.burst(6);
+    await nextTick();
+    expect(wrapper.findAll('.particle')).toHaveLength(6);
+
+    setHidden(true);
+    await nextTick();
+    expect(wrapper.findAll('.particle')).toHaveLength(0);
+
+    // 隐藏期间清理的计时器不再复活（§6.3 不回放）。
+    await vi.advanceTimersByTimeAsync(2000);
+    expect(wrapper.findAll('.particle')).toHaveLength(0);
+  });
+
+  it('does not render particles under reduced motion, and clears in-flight ones when it turns on', async () => {
+    const wrapper = mountParticles();
+
+    setReducedMotion(true);
+    wrapper.vm.burst(4);
+    await nextTick();
+    expect(wrapper.findAll('.particle')).toHaveLength(0); // 不漂浮（§6.3）
+
+    setReducedMotion(false);
+    wrapper.vm.burst(2);
+    await nextTick();
+    expect(wrapper.findAll('.particle')).toHaveLength(2);
+
+    // 漂浮中途开启「减少动画」：在屏粒子立即清空（不残留冻结心形）。
+    setReducedMotion(true);
+    await nextTick();
+    expect(wrapper.findAll('.particle')).toHaveLength(0);
+  });
+});

apps/viewer/src/__tests__/interaction-notice.spec.ts

@@ -0,0 +1,104 @@
+import { mount, type VueWrapper } from '@vue/test-utils';
+import { nextTick } from 'vue';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import InteractionNotice from '../components/viewer/InteractionNotice.vue';
+import { createViewerI18n, type ViewerI18n } from '../i18n';
+
+// UI-02 V05 InteractionNotice 单测（§6.2/§6.3）：他人点赞紧凑通知（缩略图 +
+// ♥ + delta）、点击定位上抛 select、同屏至多 3 条（超限弃最旧）、约 4s 自动
+// 消散、页面隐藏即清空；列表不 aria-live（读屏节流汇总，§6.3）。
+
+let i18n: ViewerI18n;
+const mounted: VueWrapper[] = [];
+
+interface NoticeExposed {
+  notify: (entry: { photoId: string; delta: number; thumbUrl: string | null }) => void;
+}
+
+function mountNotice(): VueWrapper & { vm: NoticeExposed } {
+  const wrapper = mount(InteractionNotice, { global: { plugins: [i18n] } });
+  mounted.push(wrapper);
+  return wrapper as VueWrapper & { vm: NoticeExposed };
+}
+
+function setHidden(hidden: boolean): void {
+  Object.defineProperty(document, 'hidden', { value: hidden, configurable: true });
+  document.dispatchEvent(new Event('visibilitychange'));
+}
+
+function entry(photoId: string, delta: number) {
+  return { photoId, delta, thumbUrl: `http://img.test/${photoId}-thumb.jpg` };
+}
+
+describe('interaction notice (UI-02 V05)', () => {
+  beforeEach(() => {
+    localStorage.clear();
+    i18n = createViewerI18n('zh-CN');
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    while (mounted.length > 0) mounted.pop()?.unmount();
+    vi.useRealTimers();
+    setHidden(false);
+  });
+
+  it('renders a compact notice with thumbnail, heart and +delta; click emits select', async () => {
+    const wrapper = mountNotice();
+
+    wrapper.vm.notify(entry('p2', 3));
+    await nextTick();
+
+    const notice = wrapper.find('.notice');
+    expect(notice.exists()).toBe(true);
+    expect(notice.find('.notice-thumb').attributes('src')).toBe('http://img.test/p2-thumb.jpg');
+    expect(notice.find('.notice-heart').text()).toBe('♥');
+    expect(notice.find('.notice-delta').text()).toBe('+3');
+    // 列表本身不 aria-live（§6.3 取消逐条播报；节流汇总另置 role=status）。
+    expect(wrapper.find('.interaction-notice-zone').attributes('aria-live')).toBeUndefined();
+    expect(wrapper.find('.sr-summary').attributes('role')).toBe('status');
+
+    await notice.trigger('click');
+    expect(wrapper.emitted('select')).toEqual([['p2']]);
+  });
+
+  it('caps concurrent notices at 3, dropping the oldest', async () => {
+    const wrapper = mountNotice();
+
+    wrapper.vm.notify(entry('p2', 1));
+    wrapper.vm.notify(entry('p3', 2));
+    wrapper.vm.notify(entry('p4', 4));
+    wrapper.vm.notify(entry('p5', 8));
+    await nextTick();
+
+    const deltas = wrapper.findAll('.notice-delta').map((delta) => delta.text());
+    expect(deltas).toEqual(['+2', '+4', '+8']); // 最旧的 +1 被丢弃
+  });
+
+  it('auto-dismisses notices after ~4s', async () => {
+    const wrapper = mountNotice();
+
+    wrapper.vm.notify(entry('p2', 1));
+    await nextTick();
+    expect(wrapper.findAll('.notice')).toHaveLength(1);
+
+    await vi.advanceTimersByTimeAsync(4000);
+    expect(wrapper.findAll('.notice')).toHaveLength(0);
+  });
+
+  it('clears notices when the page becomes hidden', async () => {
+    const wrapper = mountNotice();
+
+    wrapper.vm.notify(entry('p2', 1));
+    wrapper.vm.notify(entry('p3', 2));
+    await nextTick();
+    expect(wrapper.findAll('.notice')).toHaveLength(2);
+
+    setHidden(true);
+    await nextTick();
+    expect(wrapper.findAll('.notice')).toHaveLength(0);
+
+    await vi.advanceTimersByTimeAsync(5000);
+    expect(wrapper.findAll('.notice')).toHaveLength(0);
+  });
+});

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

@@ -2,32 +2,39 @@ import { readFileSync } from 'node:fs';
 import { dirname, join } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { flushPromises, mount, type VueWrapper } from '@vue/test-utils';
-import { defineComponent, nextTick, ref } from 'vue';
+import { defineComponent, nextTick, reactive, ref, type Ref } from 'vue';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 import {
   ApiError,
   getPublicPhoto,
   getPublicPhotos,
+  postLikeBatch,
   type PublicPhoto,
   type PublicPhotoList,
 } from '../api/client';
 import { createViewerI18n, type ViewerI18n } from '../i18n';
 import PhotoLightbox from '../components/PhotoLightbox.vue';
+import type { DownloadController } from '../download/useDownload';
 import { usePhotoSequence, type PhotoSequence } from '../feed/sequence';
+import { useLikes } from '../likes/useLikes';
+import type { LikeBubble } from '../realtime/useAlbumRealtime';
 
 // PhotoLightbox 组件测试（Task 8 业务 + UI-02 V04 深色布局）：
 // browse 渲染/导航/序列扩展、wheel 缩放与双击复位、Esc/关闭/舞台空白点击关闭、
 // 指针轻扫切换、签名过期静默重取与 404 移除上报；V04 新增：位置计数三种
-// 真实回退、缩略图条渲染与选择、更多菜单、焦点管理、body 滚动锁、安全区。
+// 真实回退、缩略图条渲染与选择、更多菜单、焦点管理、body 滚动锁、安全区；
-// 深链解析与 URL 同步在 viewer-route.spec（真实路由）覆盖。
+// V05 新增（独立 describe）：本地点赞/他人点赞 → 心形粒子与跨照片互动提示
+// 分层、navigator.share 分享与剪贴板回退、下载失败归属照片。深链解析与 URL
+// 同步在 viewer-route.spec（真实路由）覆盖。
 
 vi.mock('../api/client', async (importOriginal) => {
   const actual = await importOriginal<typeof import('../api/client')>();
-  return { ...actual, getPublicPhotos: vi.fn(), getPublicPhoto: vi.fn() };
+  return { ...actual, getPublicPhotos: vi.fn(), getPublicPhoto: vi.fn(), postLikeBatch: vi.fn() };
 });
 
 const mockedGetPublicPhotos = vi.mocked(getPublicPhotos);
 const mockedGetPublicPhoto = vi.mocked(getPublicPhoto);
+const mockedPostLikeBatch = vi.mocked(postLikeBatch);
 
 function makePhoto(id: string, likeCount = 0): PublicPhoto {
   return {
@@ -448,3 +455,164 @@ describe('photo lightbox dark viewer (UI-02 V04)', () => {
     expect(source).toContain('env(safe-area-inset-bottom, 0px)');
   });
 });
+
+describe('photo lightbox interactions (UI-02 V05)', () => {
+  interface V05Options {
+    bubbles?: LikeBubble[];
+    download?: unknown;
+    albumTitle?: string;
+    shareUrl?: string;
+  }
+
+  /** 宿主：sequence + likes + 实时气泡 ref + v-model photoId（镜像 ActivityPage
+   * 的 V05 组装：粒子/互动提示/分享深链）。 */
+  function mountV05(
+    photoId: string,
+    options: V05Options = {},
+  ): { wrapper: VueWrapper; bubbles: Ref<LikeBubble[]>; current: Ref<string> } {
+    let bubbles!: Ref<LikeBubble[]>;
+    let current!: Ref<string>;
+    const Host = defineComponent({
+      components: { PhotoLightbox },
+      setup() {
+        const sequence = usePhotoSequence({
+          token: ref('tok-lb'),
+          locale: ref('zh-CN'),
+          category: ref(null),
+        });
+        const likes = useLikes({ token: ref('tok-lb'), photos: () => sequence.photos });
+        bubbles = ref(options.bubbles ?? []);
+        current = ref(photoId);
+        return {
+          sequence,
+          likes,
+          bubbles,
+          current,
+          albumTitle: options.albumTitle,
+          shareUrl: options.shareUrl,
+          download: options.download,
+        };
+      },
+      template: `<PhotoLightbox
+        v-model:photo-id="current"
+        :sequence="sequence"
+        :likes="likes"
+        :like-bubbles="bubbles"
+        :album-title="albumTitle"
+        :share-url="shareUrl"
+        :download="download"
+      />`,
+    });
+    const wrapper = mount(Host, { global: { plugins: [i18n] } });
+    mounted.push(wrapper);
+    return { wrapper, bubbles, current };
+  }
+
+  beforeEach(() => {
+    localStorage.clear();
+    i18n = createViewerI18n('zh-CN');
+    mockedGetPublicPhotos.mockReset().mockResolvedValue(makeList([makePhoto('p1'), makePhoto('p2'), makePhoto('p3')]));
+    mockedGetPublicPhoto.mockReset();
+    mockedPostLikeBatch.mockReset().mockResolvedValue({ total: 0, countVersion: 1, batchAccepted: true });
+    document.body.style.overflow = '';
+  });
+
+  afterEach(() => {
+    while (mounted.length > 0) {
+      mounted.pop()?.unmount();
+    }
+    Reflect.deleteProperty(navigator, 'share');
+    Reflect.deleteProperty(navigator, 'clipboard');
+    vi.restoreAllMocks();
+    document.body.style.overflow = '';
+    document.documentElement.className = '';
+  });
+
+  it('bursts heart particles for a local like click on the current photo', async () => {
+    const { wrapper } = mountV05('p1');
+    await flushPromises();
+
+    expect(wrapper.findAll('.heart-particles-zone .particle')).toHaveLength(0);
+    await wrapper.find('.like-slot .action-btn').trigger('click');
+    await nextTick();
+    expect(wrapper.findAll('.heart-particles-zone .particle')).toHaveLength(2);
+  });
+
+  it('routes realtime bursts: particles for the current photo, a notice for others; notice click navigates', async () => {
+    const { wrapper, bubbles, current } = mountV05('p1');
+    await flushPromises();
+
+    // 当前照片的他人点赞（router 已滤自身回声）→ 舞台右区粒子。
+    bubbles.value = [...bubbles.value, { key: 1, photoId: 'p1', delta: 5, thumbUrl: null }];
+    await nextTick();
+    expect(wrapper.findAll('.heart-particles-zone .particle')).toHaveLength(2);
+
+    // 其他照片 → 互动提示（缩略图 + ♥ + delta），不新增当前照片粒子。
+    bubbles.value = [...bubbles.value, { key: 2, photoId: 'p2', delta: 3, thumbUrl: 'http://img.test/p2-thumb.jpg' }];
+    await nextTick();
+    const notice = wrapper.find('.interaction-notice-zone .notice');
+    expect(notice.exists()).toBe(true);
+    expect(notice.find('.notice-thumb').attributes('src')).toBe('http://img.test/p2-thumb.jpg');
+    expect(notice.find('.notice-delta').text()).toBe('+3');
+    expect(wrapper.findAll('.heart-particles-zone .particle')).toHaveLength(2);
+
+    // 点击定位：与缩略图条共用入口（update:photoId，序列内导航）。
+    await notice.trigger('click');
+    expect(current.value).toBe('p2');
+  });
+
+  it('shares via navigator.share with the album title and photo deep link; success is silent', async () => {
+    const share = vi.fn(() => Promise.resolve());
+    Object.defineProperty(navigator, 'share', { value: share, configurable: true });
+    const { wrapper } = mountV05('p1', {
+      albumTitle: '2026 公司年会',
+      shareUrl: '/a/tok-lb/p/p1?lang=zh-CN',
+    });
+    await flushPromises();
+
+    await wrapper.find('button[aria-label="分享照片"]').trigger('click');
+    await flushPromises();
+    expect(share).toHaveBeenCalledWith({ title: '2026 公司年会', url: '/a/tok-lb/p/p1?lang=zh-CN' });
+    // 原生分享成功：无应用内轻提示（面板已收尾，§5.4）。
+    expect(wrapper.find('.share-status').exists()).toBe(false);
+  });
+
+  it('falls back to the clipboard with feedback when native share is unavailable', async () => {
+    const writeText = vi.fn(() => Promise.resolve());
+    Object.defineProperty(navigator, 'clipboard', { value: { writeText }, configurable: true });
+    const { wrapper } = mountV05('p1', { shareUrl: '/a/tok-lb/p/p1?lang=zh-CN' });
+    await flushPromises();
+
+    await wrapper.find('button[aria-label="分享照片"]').trigger('click');
+    await flushPromises();
+    expect(writeText).toHaveBeenCalledWith('/a/tok-lb/p/p1?lang=zh-CN');
+    expect(wrapper.find('.share-status').text()).toContain('链接已复制');
+  });
+
+  it('shows the download failure only on the photo that triggered it', async () => {
+    // 控制器桩：失败已归属 p1（useDownload.failedFor，§5.4 异步错误归属）。
+    const download = reactive({
+      busy: false,
+      failed: 'download.failed',
+      failedFor: 'p1',
+      wechatGuide: false,
+      copyNotice: '',
+      canDownload: true,
+      canDownloadOriginal: false,
+    }) as unknown as DownloadController;
+    const { wrapper, current } = mountV05('p1', { download });
+    await flushPromises();
+
+    expect(wrapper.find('.download-failed').text()).toContain('下载失败');
+
+    // 切到 p2：p1 的下载错误不张冠李戴到当前照片。
+    current.value = 'p2';
+    await nextTick();
+    expect(wrapper.find('.download-failed').exists()).toBe(false);
+
+    // 切回 p1：错误提示仍归属原照片（可再见）。
+    current.value = 'p1';
+    await nextTick();
+    expect(wrapper.find('.download-failed').exists()).toBe(true);
+  });
+});

apps/viewer/src/__tests__/photo-action-bar.spec.ts

@@ -14,13 +14,11 @@ function mountBar(props: {
   likeCount: number;
   canDownload?: boolean;
   canDownloadOriginal?: boolean;
-  isLiking?: boolean;
 }): VueWrapper {
   const wrapper = mount(PhotoActionBar, {
     props: {
       canDownload: false,
       canDownloadOriginal: false,
-      isLiking: false,
       ...props,
     },
     global: { plugins: [i18n] },

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

@@ -0,0 +1,69 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { copyText } from '../support/clipboard';
+import { shareOrCopy } from '../support/share';
+
+// UI-02 V05 分享编排单测（§5.4）：navigator.share 优先（成功即原生面板收尾）；
+// AbortError = 用户取消（静默，不落剪贴板）；其他失败/不可用回退剪贴板；
+// 复制失败返回 failed（调用方展示可选中文本）。
+
+vi.mock('../support/clipboard', () => ({ copyText: vi.fn() }));
+
+const mockedCopyText = vi.mocked(copyText);
+
+function stubShare(implementation: () => Promise<void>): ReturnType<typeof vi.fn> {
+  const fn = vi.fn(implementation);
+  Object.defineProperty(navigator, 'share', { value: fn, configurable: true });
+  return fn;
+}
+
+describe('share orchestration (UI-02 V05)', () => {
+  beforeEach(() => {
+    mockedCopyText.mockReset();
+  });
+
+  afterEach(() => {
+    Reflect.deleteProperty(navigator, 'share');
+    vi.restoreAllMocks();
+  });
+
+  it('uses navigator.share when available and does not touch the clipboard', async () => {
+    const share = stubShare(() => Promise.resolve());
+
+    const outcome = await shareOrCopy({ title: 'Annual Party', url: 'https://x.test/a/tok?lang=en' });
+    expect(outcome).toBe('shared');
+    expect(share).toHaveBeenCalledWith({ title: 'Annual Party', url: 'https://x.test/a/tok?lang=en' });
+    expect(mockedCopyText).not.toHaveBeenCalled();
+  });
+
+  it('treats AbortError as a silent cancel (no error, no clipboard fallback)', async () => {
+    const share = stubShare(() => {
+      const error = new Error('The operation was aborted.');
+      error.name = 'AbortError';
+      return Promise.reject(error);
+    });
+
+    const outcome = await shareOrCopy({ title: 't', url: 'https://x.test/a/tok' });
+    expect(outcome).toBe('cancelled');
+    expect(share).toHaveBeenCalledTimes(1);
+    expect(mockedCopyText).not.toHaveBeenCalled();
+  });
+
+  it('falls back to the clipboard when navigator.share rejects with another error', async () => {
+    stubShare(() => Promise.reject(new TypeError('Not allowed to share')));
+    mockedCopyText.mockResolvedValue(true);
+
+    const outcome = await shareOrCopy({ title: 't', url: 'https://x.test/a/tok' });
+    expect(outcome).toBe('copied');
+    expect(mockedCopyText).toHaveBeenCalledWith('https://x.test/a/tok');
+  });
+
+  it('falls back to the clipboard without navigator.share; reports failure when copying fails', async () => {
+    expect('share' in navigator).toBe(false); // jsdom 默认无 navigator.share
+
+    mockedCopyText.mockResolvedValueOnce(true);
+    await expect(shareOrCopy({ title: 't', url: 'https://x.test/a/tok' })).resolves.toBe('copied');
+
+    mockedCopyText.mockResolvedValueOnce(false);
+    await expect(shareOrCopy({ title: 't', url: 'https://x.test/a/tok' })).resolves.toBe('failed');
+  });
+});

apps/viewer/src/components/PhotoLightbox.vue

@@ -5,9 +5,12 @@ import type { DownloadVariant } from '../api/client';
 import type { PhotoSequence } from '../feed/sequence';
 import type { DownloadController } from '../download/useDownload';
 import type { LikesController } from '../likes/useLikes';
+import type { LikeBubble } from '../realtime/useAlbumRealtime';
 import PhotoActionBar from './viewer/PhotoActionBar.vue';
+import HeartParticles from './viewer/HeartParticles.vue';
+import InteractionNotice from './viewer/InteractionNotice.vue';
 import ThumbnailStrip, { type ThumbnailItem } from './viewer/ThumbnailStrip.vue';
-import { copyText } from '../support/clipboard';
+import { shareOrCopy } from '../support/share';
 import { reducedMotion, toggleReducedMotion } from '../ui/prefs';
 import { positionDisplay } from '../viewer/position';
 import { MIN_SCALE, panBy, resetZoom, wheelFactor, zoomAt, type ZoomState } from '../viewer/zoom';
@@ -44,6 +47,13 @@ const props = defineProps<{
   likes?: LikesController;
   /** 下载控制器（P4a Task 4）：缺省时不渲染下载位（组件单测/降级组装）。 */
   download?: DownloadController;
+  /** 相册标题（§5.4 navigator.share 的分享标题）。 */
+  albumTitle?: string;
+  /** 当前照片分享深链（含 lang 参数，ActivityPage 组装；缺省回退当前地址）。 */
+  shareUrl?: string;
+  /** 他人点赞气泡（WS likes.burst，realtime router 已滤自身回声/隐藏/减少动画）：
+   * 当前照片 → 心形粒子，其他照片 → 跨照片互动提示（§6.2 分层）。 */
+  likeBubbles?: LikeBubble[];
 }>();
 
 const emit = defineEmits<{
@@ -361,6 +371,53 @@ function likeCurrent(): void {
   props.likes.like(photo.value.photoId);
 }
 
+// —— 互动编排（Task 5 / V05 §6.2）：当前照片心形粒子 + 其他照片互动提示分层 ——
+
+const heartParticles = ref<{ burst: (count: number) => void } | null>(null);
+const interactionNotice = ref<{ notify: (entry: { photoId: string; delta: number; thumbUrl: string | null }) => void } | null>(null);
+
+/** 本地点赞每次有效点击的粒子数（1-3 取中，§6.1 立即轻量反馈）。 */
+const LOCAL_LIKE_PARTICLES = 2;
+
+// 本地点击（useLikes 动效事件）：当前照片 → 舞台右区心形粒子。
+let stopLocalLikeListener: (() => void) | undefined;
+if (props.likes !== undefined) {
+  stopLocalLikeListener = props.likes.onLocalLike((photoId) => {
+    if (photoId === props.photoId) heartParticles.value?.burst(LOCAL_LIKE_PARTICLES);
+  });
+}
+
+// 他人点赞气泡（§6.2 两类反馈分开）：当前照片 → 粒子（1-2 枚按 delta 采样，
+// 数值仍按真实 delta 校准——视觉采样不改变统计，§6.3）；其他照片 → 互动提示。
+// 仅处理挂载后新到的气泡：打开大图瞬间已在屏的不回放（§6.3 不回放历史动画）。
+let bubblesInitialized = false;
+let maxSeenBubbleKey = Number.NEGATIVE_INFINITY;
+watch(
+  () => props.likeBubbles,
+  (bubbles) => {
+    if (bubbles === undefined) return;
+    if (!bubblesInitialized) {
+      bubblesInitialized = true;
+      for (const bubble of bubbles) maxSeenBubbleKey = Math.max(maxSeenBubbleKey, bubble.key);
+      return;
+    }
+    for (const bubble of bubbles) {
+      if (bubble.key <= maxSeenBubbleKey) continue;
+      maxSeenBubbleKey = bubble.key;
+      if (bubble.photoId === props.photoId) {
+        heartParticles.value?.burst(Math.min(2, Math.max(1, bubble.delta)));
+      } else {
+        interactionNotice.value?.notify({
+          photoId: bubble.photoId,
+          delta: bubble.delta,
+          thumbUrl: bubble.thumbUrl,
+        });
+      }
+    }
+  },
+  { immediate: true },
+);
+
 // —— 下载（P4a Task 4）：入口与二级菜单在 PhotoActionBar，控制器编排在此 ——
 
 const canDownload = computed(() => props.download !== undefined && props.download.canDownload);
@@ -370,20 +427,22 @@ function onDownloadVariant(variant: DownloadVariant): void {
   void props.download?.download(variant);
 }
 
-// —— 分享（V04 最小实现：复制当前照片深链——路由已同步 /p/:photoId；
+// —— 分享（V05 §5.4）：navigator.share 优先（成功/取消无额外反馈——原生面板
-//    navigator.share 编排与语言参数属 Task 5/V05） ——
+//    已收尾；AbortError 静默），不可用或其他失败回退剪贴板；复制失败保留
+//    可选中文本。分享目标为照片深链（含 lang 参数，ActivityPage 组装），
+//    不分享 OSS 签名 URL ——
 
 const shareState = ref<'idle' | 'copied' | 'failed'>('idle');
 const shareUrlText = ref('');
 let shareResetTimer: ReturnType<typeof setTimeout> | undefined;
 
 async function shareCurrent(): Promise<void> {
-  shareUrlText.value = window.location.href;
+  shareUrlText.value = props.shareUrl ?? window.location.href;
-  const copied = await copyText(shareUrlText.value);
+  const outcome = await shareOrCopy({ title: props.albumTitle ?? '', url: shareUrlText.value });
-  shareState.value = copied ? 'copied' : 'failed';
+  shareState.value = outcome === 'copied' ? 'copied' : outcome === 'failed' ? 'failed' : 'idle';
   if (shareResetTimer !== undefined) clearTimeout(shareResetTimer);
   // 失败时保留可选中文本（不自动消失），成功反馈数秒后收起。
-  if (copied) {
+  if (outcome === 'copied') {
     shareResetTimer = setTimeout(() => {
       shareState.value = 'idle';
     }, 3000);
@@ -461,6 +520,7 @@ onBeforeUnmount(() => {
   document.removeEventListener('pointerdown', onOuterPointerDown, true);
   document.body.style.overflow = savedBodyOverflow;
   if (shareResetTimer !== undefined) clearTimeout(shareResetTimer);
+  stopLocalLikeListener?.(); // 粒子订阅随大图卸载解除（useLikes 侧不残留）
   // 焦点归还触发元素（瀑布流单元格；深链直达时为 body——无可归还则不动）。
   if (savedFocus !== null && savedFocus.isConnected) savedFocus.focus();
 });
@@ -565,20 +625,27 @@ onBeforeUnmount(() => {
         </svg>
       </button>
 
-      <!-- 心形粒子层（Task 5 / V05 填充）：装饰性、不可交互 -->
+      <!-- 心形粒子层（Task 5 / V05 §6.2）：装饰性、不可交互；触发见上方互动编排 -->
-      <div class="heart-particles-zone" aria-hidden="true" style="pointer-events: none" />
+      <HeartParticles ref="heartParticles" />
-      <!-- 跨照片互动提示层（Task 5 / V05 填充）：底部操作栏上方安全区 -->
+      <!-- 跨照片互动提示层（Task 5 / V05 §6.2）：底部操作栏上方安全区；
-      <div class="interaction-notice-zone" />
+           点击定位 = 缩略图条共用入口（序列未含该照片时忽略——不伪造定位） -->
+      <InteractionNotice ref="interactionNotice" @select="selectThumbnail" />
 
       <div class="stage-notices">
         <p v-if="extending" class="loading">{{ t('album.loading') }}</p>
-        <!-- 分享反馈轻提示（复制成功/失败；失败保留可选中文本） -->
+        <!-- 分享反馈轻提示（回退复制成功/失败；失败保留可选中文本；原生分享
+             成功/取消不显示——面板已收尾，§5.4） -->
         <p v-if="shareState !== 'idle'" class="share-status" role="status">
           {{ shareState === 'copied' ? t('viewer.shareCopied') : t('viewer.shareCopyFailed') }}
           <span v-if="shareState === 'failed'" class="share-url">{{ shareUrlText }}</span>
         </p>
-        <!-- 下载失败轻提示（端点失败/网络；DOWNLOAD_DISABLED 专属文案）。 -->
+        <!-- 下载失败轻提示（端点失败/网络；DOWNLOAD_DISABLED 专属文案）：
-        <p v-if="download !== undefined && download.failed" class="download-failed" role="alert">
+             仅归属到触发下载的那张照片（§5.4 异步错误归属）。 -->
+        <p
+          v-if="download !== undefined && download.failed && download.failedFor === photo.photoId"
+          class="download-failed"
+          role="alert"
+        >
           {{ t(download.failed) }}
         </p>
       </div>
@@ -821,23 +888,8 @@ onBeforeUnmount(() => {
   right: 8px;
 }
 
-/* 粒子/互动占位层（Task 5 填充）：舞台右侧上浮 / 操作栏上方安全区。 */
+/* 粒子层/互动提示层的定位与样式由 HeartParticles / InteractionNotice 自带
-.heart-particles-zone {
+ * （Task 5：舞台右侧上浮 / 操作栏上方安全区）。 */
-  position: absolute;
-  inset: 0;
-  overflow: hidden;
-}
-.interaction-notice-zone {
-  position: absolute;
-  bottom: 12px;
-  left: 16px;
-  right: 16px;
-  display: flex;
-  flex-direction: column;
-  align-items: flex-start;
-  gap: 6px;
-  pointer-events: none;
-}
 .stage-notices {
   position: absolute;
   bottom: 12px;

apps/viewer/src/components/album/AlbumHeader.vue

@@ -3,7 +3,7 @@ import { computed, onBeforeUnmount, ref, watch } from 'vue';
 import { useI18n } from 'vue-i18n';
 import { useRouter } from 'vue-router';
 import type { PublicAlbum, SortMode } from '../../api/client';
-import { copyText } from '../../support/clipboard';
+import { shareOrCopy } from '../../support/share';
 
 // UI-02 V02 活动信息区（从 ActivityPage 提取）：宣传图 + 标题/分享 + 说明 +
 // 元信息行（浏览/日期/地点）+ 排序/分类工具栏。数据与筛选决策仍在父级
@@ -122,21 +122,23 @@ const venueText = computed(() => {
 
 const descriptionText = computed(() => props.album.translation.description);
 
-// —— 分享（V02 最小实现：复制相册链接；navigator.share 完整编排属 Task 5） ——
+// —— 分享（V05 §5.4 完整编排）：navigator.share 优先（相册标题 + 相册路由
+//    URL，附 lang 参数；不分享 OSS URL），不可用/失败回退剪贴板；复制失败
+//    保留可选中文本；用户取消原生分享不显示错误 ——
 const shareState = ref<'idle' | 'copied' | 'failed'>('idle');
 let shareResetTimer: ReturnType<typeof setTimeout> | undefined;
 
 const albumUrl = computed(() => {
   const path = router.resolve({ name: 'activity', params: { token: props.album.publicToken } }).href;
-  return new URL(path, window.location.origin).href;
+  return new URL(`${path}?lang=${locale.value}`, window.location.origin).href;
 });
 
 async function share(): Promise<void> {
-  const copied = await copyText(albumUrl.value);
+  const outcome = await shareOrCopy({ title: props.album.translation.title, url: albumUrl.value });
-  shareState.value = copied ? 'copied' : 'failed';
+  shareState.value = outcome === 'copied' ? 'copied' : outcome === 'failed' ? 'failed' : 'idle';
   if (shareResetTimer !== undefined) clearTimeout(shareResetTimer);
   // 失败时保留可选中文本（不自动消失），成功反馈数秒后收起。
-  if (copied) {
+  if (outcome === 'copied') {
     shareResetTimer = setTimeout(() => {
       shareState.value = 'idle';
     }, 3000);
@@ -182,7 +184,7 @@ onBeforeUnmount(() => {
     <header class="album-info">
       <div class="title-row">
         <h1 ref="titleEl" class="title" :class="{ clamped: !titleExpanded }">{{ album.translation.title }}</h1>
-        <button type="button" class="share-btn" @click="share">
+        <button type="button" class="share-btn" :aria-label="t('viewer.shareAlbum')" @click="share">
           <svg viewBox="0 0 24 24" aria-hidden="true" focusable="false">
             <path d="M12 3v12" />
             <path d="m7 8 5-5 5 5" />

apps/viewer/src/components/viewer/HeartParticles.vue

@@ -0,0 +1,184 @@
+<script setup lang="ts">
+import { onBeforeUnmount, onMounted, ref, watch } from 'vue';
+import { reducedMotion } from '../../ui/prefs';
+
+// UI-02 §6.2/§6.3 装饰心形粒子（Task 5 / V05）：coral 半透明心形自舞台右区
+// 上浮，2-3 条轻微漂移轨迹，约 1.2-1.8s 消散。纯装饰层：pointer-events:none
+// + aria-hidden（§6.2）；同时至多 12 枚（超出弃最旧，§6.3），每枚带自清理
+// 定时器；页面隐藏/「减少动画」开启/组件卸载即清空，不排队回放历史动画。
+// 触发源由 PhotoLightbox 编排：当前照片本地点赞（useLikes.onLocalLike）或
+// 该照片收到他人点赞 WS 气泡（自身回声已在 realtime router 滤除）。计数与
+// 批次业务完全不受本层影响（§6.1「不为动画补帧额外发送点赞」）。
+
+/** 同屏粒子上限（§6.3：超出丢弃最旧）。 */
+const PARTICLE_CAP = 12;
+/** 漂移轨迹变体（§6.3「2-3 条轻微漂移轨迹」）。 */
+const DRIFT_PATHS = ['a', 'b', 'c'] as const;
+
+interface Particle {
+  key: number;
+  /** 起始水平位置（舞台右区，§6.2「大图内靠右侧上浮」；百分比）。 */
+  x: number;
+  /** 起始垂直位置（自底部，百分比）。 */
+  y: number;
+  /** 心形字号 = 粒子边长（18-30px，§6.3）。 */
+  size: number;
+  /** 水平漂移量（px，正负均可）。 */
+  drift: number;
+  /** 动画时长（1.2-1.8s，§6.3）。 */
+  dur: number;
+  path: (typeof DRIFT_PATHS)[number];
+}
+
+const particles = ref<Particle[]>([]);
+
+let nextKey = 0;
+const removeTimers = new Set<ReturnType<typeof setTimeout>>();
+
+/** 减少动画判定：应用内偏好或系统 prefers-reduced-motion 任一命中即不漂浮。 */
+function motionReduced(): boolean {
+  if (reducedMotion.value) return true;
+  if (typeof window.matchMedia === 'function') {
+    return window.matchMedia('(prefers-reduced-motion: reduce)').matches;
+  }
+  return false;
+}
+
+/** 触发一次上浮（count 会被钳到上限内）。「减少动画」时不生成（§6.3）。 */
+function burst(count: number): void {
+  if (motionReduced()) return;
+  const created: Particle[] = [];
+  for (let i = 0; i < count; i += 1) {
+    const particle: Particle = {
+      key: ++nextKey,
+      x: 62 + Math.round(Math.random() * 26),
+      y: 8 + Math.round(Math.random() * 26),
+      size: 18 + Math.round(Math.random() * 12),
+      drift: Math.round((Math.random() * 2 - 1) * 56),
+      dur: 1200 + Math.round(Math.random() * 600),
+      path: DRIFT_PATHS[nextKey % DRIFT_PATHS.length],
+    };
+    created.push(particle);
+    const timer = setTimeout(() => {
+      removeTimers.delete(timer);
+      particles.value = particles.value.filter((item) => item.key !== particle.key);
+    }, particle.dur + 60); // 动画结束后移除（+60ms 缓冲收尾帧）
+    removeTimers.add(timer);
+  }
+  // 上限裁剪：slice(-0) 会返回整个数组，room<=0 时必须显式清空。
+  const room = PARTICLE_CAP - created.length;
+  particles.value = [...(room > 0 ? particles.value.slice(-room) : []), ...created];
+}
+
+function clearAll(): void {
+  for (const timer of removeTimers) clearTimeout(timer);
+  removeTimers.clear();
+  particles.value = [];
+}
+
+function onVisibilityChange(): void {
+  // 页面隐藏：清空在屏粒子与计时器（§6.3「恢复后不回放大量历史动画」）。
+  if (document.hidden) clearAll();
+}
+
+// 「减少动画」开启瞬间：正在漂浮的立即静止清空（不残留冻结的心形）。
+watch(reducedMotion, (enabled) => {
+  if (enabled) clearAll();
+});
+
+onMounted(() => document.addEventListener('visibilitychange', onVisibilityChange));
+
+onBeforeUnmount(() => {
+  document.removeEventListener('visibilitychange', onVisibilityChange);
+  clearAll();
+});
+
+defineExpose({ burst });
+</script>
+
+<template>
+  <div class="heart-particles-zone" aria-hidden="true">
+    <span
+      v-for="particle in particles"
+      :key="particle.key"
+      class="particle"
+      :class="`drift-${particle.path}`"
+      :style="{
+        left: `${particle.x}%`,
+        bottom: `${particle.y}%`,
+        fontSize: `${particle.size}px`,
+        '--drift': `${particle.drift}px`,
+        '--dur': `${particle.dur}ms`,
+      }"
+    >♥</span>
+  </div>
+</template>
+
+<style scoped>
+/* 装饰层：不拦截任何指针事件（§6.2）；溢出裁剪防漂出舞台。 */
+.heart-particles-zone {
+  position: absolute;
+  inset: 0;
+  overflow: hidden;
+  pointer-events: none;
+}
+.particle {
+  position: absolute;
+  line-height: 1;
+  color: var(--viewer-like-accent, #ff667d);
+  text-shadow: 0 0 8px rgba(255, 102, 125, 0.35);
+  animation: heart-float-a var(--dur) ease-out forwards;
+  will-change: transform, opacity;
+}
+/* 2-3 条漂移轨迹（§6.3）：直线 / 先外后回 / 先内后回，摆幅共用 --drift。 */
+.drift-b {
+  animation-name: heart-float-b;
+}
+.drift-c {
+  animation-name: heart-float-c;
+}
+/* 系统「减少动画」：不漂浮（应用内偏好在 burst() 入口已拦截）。 */
+@media (prefers-reduced-motion: reduce) {
+  .particle {
+    animation: none;
+  }
+}
+@keyframes heart-float-a {
+  from {
+    transform: translateY(0) translateX(0) scale(0.9);
+    opacity: 0.85;
+  }
+  to {
+    transform: translateY(-220px) translateX(var(--drift)) scale(1.15);
+    opacity: 0;
+  }
+}
+@keyframes heart-float-b {
+  from {
+    transform: translateY(0) translateX(0) scale(0.9);
+    opacity: 0.85;
+  }
+  55% {
+    transform: translateY(-120px) translateX(calc(var(--drift) * 1.35)) scale(1);
+    opacity: 0.55;
+  }
+  to {
+    transform: translateY(-220px) translateX(var(--drift)) scale(1.15);
+    opacity: 0;
+  }
+}
+@keyframes heart-float-c {
+  from {
+    transform: translateY(0) translateX(0) scale(0.9);
+    opacity: 0.85;
+  }
+  55% {
+    transform: translateY(-120px) translateX(calc(var(--drift) * 0.4)) scale(1.02);
+    opacity: 0.6;
+  }
+  to {
+    transform: translateY(-220px) translateX(var(--drift)) scale(1.15);
+    opacity: 0;
+  }
+}
+</style>

apps/viewer/src/components/viewer/InteractionNotice.vue

@@ -0,0 +1,183 @@
+<script lang="ts">
+/** 单条他人点赞通知的输入（PhotoLightbox 从 realtime bubbles 派发）。 */
+export interface InteractionNoticeEntry {
+  photoId: string;
+  delta: number;
+  /** 被赞照片缩略图（thumb 变体；序列未含该照片时为 null → 占位块）。 */
+  thumbUrl: string | null;
+}
+
+interface Notice extends InteractionNoticeEntry {
+  key: number;
+}
+</script>
+
+<script setup lang="ts">
+import { onBeforeUnmount, onMounted, ref } from 'vue';
+import { useI18n } from 'vue-i18n';
+
+// UI-02 §6.2 跨照片互动提示（Task 5 / V05）：大图打开期间相册内「其他」照片
+// 收到他人点赞的紧凑通知——缩略图 + ♥ +delta，点击定位到该照片（保留既有
+// 可识别提示与点击定位能力）。至多 3 条、约 4s 自动消散（§6.3）；页面隐藏/
+// 组件卸载即清空。不把其他照片的计数加到当前照片（数据面在 useLikes 校准，
+// 本层纯展示）。
+// 读屏节流（§6.3「取消逐个气泡 aria-live 播报；交互通知使用节流汇总」）：
+// 列表本身不 aria-live，仅维护一个至多每 5s 更新一次的 role=status 汇总。
+// 数据由 PhotoLightbox 从 realtime bubbles 派发（自身回声/页面隐藏/减少动画
+// 已在 realtime router 层滤除——不重复订阅 WS）。
+
+/** 通知驻留时长（毫秒，§6.3「约 4s」）。 */
+const NOTICE_MS = 4000;
+/** 同屏通知上限（§6.3：超出弃最旧）。 */
+const NOTICE_CAP = 3;
+/** 读屏汇总节流窗（毫秒）。 */
+const SUMMARY_THROTTLE_MS = 5000;
+
+const emit = defineEmits<{ select: [photoId: string] }>();
+
+const { t } = useI18n();
+
+const notices = ref<Notice[]>([]);
+/** 读屏节流汇总文本（空 = 无待播内容）。 */
+const srSummary = ref('');
+
+let nextKey = 0;
+const dismissTimers = new Set<ReturnType<typeof setTimeout>>();
+let summaryThrottleTimer: ReturnType<typeof setTimeout> | undefined;
+let summaryPendingDelta = 0;
+
+/** 新增一条他人点赞通知：超限弃最旧，并安排自动消散。 */
+function notify(entry: InteractionNoticeEntry): void {
+  const notice: Notice = { key: ++nextKey, ...entry };
+  notices.value = [...notices.value.slice(-(NOTICE_CAP - 1)), notice];
+  const timer = setTimeout(() => {
+    dismissTimers.delete(timer);
+    notices.value = notices.value.filter((item) => item.key !== notice.key);
+  }, NOTICE_MS);
+  dismissTimers.add(timer);
+  announceSummary(entry.delta);
+}
+
+function flushSummary(): void {
+  if (summaryPendingDelta <= 0) return;
+  srSummary.value = t('viewer.photoLiked', { delta: summaryPendingDelta });
+  summaryPendingDelta = 0;
+}
+
+/** 节流汇总：首条立即播报，节流窗内的后续 delta 合并到下一次。 */
+function announceSummary(delta: number): void {
+  summaryPendingDelta += delta;
+  if (summaryThrottleTimer !== undefined) return;
+  flushSummary();
+  summaryThrottleTimer = setTimeout(function fireSummary() {
+    summaryThrottleTimer = undefined;
+    if (summaryPendingDelta > 0) {
+      flushSummary();
+      summaryThrottleTimer = setTimeout(fireSummary, SUMMARY_THROTTLE_MS);
+    }
+  }, SUMMARY_THROTTLE_MS);
+}
+
+function clearAll(): void {
+  for (const timer of dismissTimers) clearTimeout(timer);
+  dismissTimers.clear();
+  if (summaryThrottleTimer !== undefined) clearTimeout(summaryThrottleTimer);
+  summaryThrottleTimer = undefined;
+  summaryPendingDelta = 0;
+  srSummary.value = '';
+  notices.value = [];
+}
+
+function onVisibilityChange(): void {
+  // 页面隐藏：清空在屏通知与计时器（§6.3，不排队回放）。
+  if (document.hidden) clearAll();
+}
+
+onMounted(() => document.addEventListener('visibilitychange', onVisibilityChange));
+
+onBeforeUnmount(() => {
+  document.removeEventListener('visibilitychange', onVisibilityChange);
+  clearAll();
+});
+
+defineExpose({ notify });
+</script>
+
+<template>
+  <div class="interaction-notice-zone">
+    <!-- 读屏节流汇总（§6.3）：不逐条播报通知，至多每 5s 一次 +delta 汇总。 -->
+    <p class="sr-summary" role="status">{{ srSummary }}</p>
+    <button
+      v-for="notice in notices"
+      :key="notice.key"
+      type="button"
+      class="notice"
+      :aria-label="t('viewer.bubbleOpen')"
+      @click="emit('select', notice.photoId)"
+    >
+      <img v-if="notice.thumbUrl !== null" class="notice-thumb" :src="notice.thumbUrl" alt="" loading="lazy">
+      <span v-else class="notice-thumb notice-placeholder" aria-hidden="true" />
+      <span class="notice-heart" aria-hidden="true">♥</span>
+      <span class="notice-delta" aria-hidden="true">{{ t('viewer.photoLiked', { delta: notice.delta }) }}</span>
+    </button>
+  </div>
+</template>
+
+<style scoped>
+/* 大图内定位（§6.2「底部操作栏上方的安全区域」）：舞台底部、不遮挡主要按钮；
+ * 容器不拦截指针，通知按钮自身可点（定位到被赞照片）。 */
+.interaction-notice-zone {
+  position: absolute;
+  bottom: 12px;
+  left: 16px;
+  right: 16px;
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 6px;
+  pointer-events: none;
+}
+.sr-summary {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  margin: -1px;
+  padding: 0;
+  border: 0;
+  overflow: hidden;
+  clip: rect(0 0 0 0);
+  white-space: nowrap;
+}
+.notice {
+  pointer-events: auto;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  border: 1px solid rgba(255, 255, 255, 0.35);
+  border-radius: var(--viewer-radius-pill, 20px);
+  background: rgba(22, 28, 36, 0.92);
+  color: #f3f4f6;
+  padding: 5px 12px 5px 5px;
+  font-size: 0.8125rem;
+  cursor: pointer;
+}
+.notice:focus-visible {
+  outline: 2px solid var(--viewer-primary, #1a73e8);
+}
+.notice-thumb {
+  display: block;
+  width: 32px;
+  height: 32px;
+  border-radius: 14px;
+  object-fit: cover;
+}
+.notice-placeholder {
+  background: rgba(255, 255, 255, 0.14);
+}
+.notice-heart {
+  color: var(--viewer-like-accent, #ff667d);
+}
+.notice-delta {
+  font-variant-numeric: tabular-nums;
+}
+</style>

apps/viewer/src/components/viewer/PhotoActionBar.vue

@@ -17,10 +17,8 @@ const props = withDefaults(
     likePop?: number;
     canDownload?: boolean;
     canDownloadOriginal?: boolean;
-    /** 点赞提交中（预留：连续点赞不禁用，仅视觉态）。 */
-    isLiking?: boolean;
   }>(),
-  { likePop: 0, canDownload: false, canDownloadOriginal: false, isLiking: false },
+  { likePop: 0, canDownload: false, canDownloadOriginal: false },
 );
 
 const emit = defineEmits<{
@@ -99,7 +97,7 @@ onBeforeUnmount(cancelPress);
       <button
         type="button"
         class="action-btn"
-        :aria-label="t('viewer.share')"
+        :aria-label="t('viewer.sharePhoto')"
         @click="emit('share')"
       >
         <svg class="action-icon" viewBox="0 0 24 24" aria-hidden="true" focusable="false">

apps/viewer/src/download/useDownload.ts

@@ -68,6 +68,9 @@ export function useDownload(inputs: DownloadInputs) {
   /** 失败文案键（''=无失败）：默认通用失败；DOWNLOAD_DISABLED 给专属文案
    * （T15 漏译修复——相册中途关闭下载开关时观众可理解的确定性提示）。 */
   const failed = ref<'' | 'download.failed' | 'errors.downloadDisabled'>('');
+  /** 失败归属照片（UI-02 §5.4）：异步错误绑定触发下载的 photoId——大图内切图
+   * 后错误提示只在切回该照片时展示，不张冠李戴到当前照片。 */
+  const failedFor = ref<string | null>(null);
   /** 微信引导浮层可见（点击下载时处于微信内置浏览器）。 */
   const wechatGuide = ref(false);
   const copyNotice = ref<'' | 'copied' | 'failed'>('');
@@ -95,6 +98,7 @@ export function useDownload(inputs: DownloadInputs) {
     if (photoId === null || busy.value) return;
     busy.value = true;
     failed.value = '';
+    failedFor.value = null;
     try {
       let credential = await getPhotoDownload(inputs.token.value, photoId, variant);
       if (isExpired(credential.expiresAt)) {
@@ -108,6 +112,7 @@ export function useDownload(inputs: DownloadInputs) {
         error instanceof ApiError && error.code === ErrorCodes.DOWNLOAD_DISABLED
           ? 'errors.downloadDisabled'
           : 'download.failed';
+      failedFor.value = photoId; // 异步错误归属触发时的照片（§5.4）
     } finally {
       busy.value = false;
     }
@@ -140,6 +145,7 @@ export function useDownload(inputs: DownloadInputs) {
   return reactive({
     busy,
     failed,
+    failedFor,
     wechatGuide,
     copyNotice,
     canDownload,

apps/viewer/src/i18n/locales/en.ts

@@ -90,6 +90,10 @@ export default {
     more: 'More options',
     thumbnails: 'Thumbnail navigation',
     thumbItem: 'Photo {n}',
+    // —— UI-02 (V05 interaction particles / share) additions ——
+    photoLiked: '+{delta}',
+    sharePhoto: 'Share photo',
+    shareAlbum: 'Share album',
   },
   route: { tokenLabel: 'Album token', photoLabel: 'Photo' },
   errors: {

apps/viewer/src/i18n/locales/zh-CN.ts

@@ -90,6 +90,10 @@ export default {
     more: '更多选项',
     thumbnails: '缩略图导航',
     thumbItem: '第 {n} 张',
+    // —— UI-02（V05 互动粒子/分享）新增 ——
+    photoLiked: '+{delta}',
+    sharePhoto: '分享照片',
+    shareAlbum: '分享相册',
   },
   route: { tokenLabel: '相册令牌', photoLabel: '照片' },
   errors: {

apps/viewer/src/likes/useLikes.ts

@@ -39,6 +39,10 @@ const MY_BATCHES_CAP = 100;
 /** sessionStorage 键：会话标识（每标签页会话一枚，跨刷新复用）。 */
 const SESSION_KEY = 'viewer.likeSessionId';
 
+/** 本地点击动效监听器（UI-02 V05）：每次有效点击立即通知——与批次发送/重试
+ * 语义完全解耦（不为动画补帧额外发送点赞，§6.1）。 */
+export type LocalLikeListener = (photoId: string) => void;
+
 /** 单照片状态（base=权威累计，pending=未落定乐观量，pop=动画 nonce）。 */
 interface PhotoLikeState {
   base: number;
@@ -88,6 +92,7 @@ export function useLikes(inputs: LikesInputs) {
 
   let flushTimer: ReturnType<typeof setTimeout> | null = null;
   const retryTimers = new Set<ReturnType<typeof setTimeout>>();
+  const localLikeListeners = new Set<LocalLikeListener>();
 
   function stateOf(photoId: string, seedCount?: number): PhotoLikeState {
     let state = states.get(photoId);
@@ -110,6 +115,8 @@ export function useLikes(inputs: LikesInputs) {
     state.pending += 1;
     state.pop += 1;
     queued.set(photoId, (queued.get(photoId) ?? 0) + 1);
+    // 本地点击动效事件（UI-02 V05）：仅通知订阅方（粒子等装饰层），不影响批次。
+    for (const listener of localLikeListeners) listener(photoId);
     if ((queued.get(photoId) ?? 0) >= LIKE_FLUSH_CAP) {
       flushQueue();
       return;
@@ -119,6 +126,14 @@ export function useLikes(inputs: LikesInputs) {
     }
   }
 
+  /** 订阅本地点击动效事件（UI-02 V05）：返回退订函数（订阅方随上下文卸载）。 */
+  function onLocalLike(listener: LocalLikeListener): () => void {
+    localLikeListeners.add(listener);
+    return () => {
+      localLikeListeners.delete(listener);
+    };
+  }
+
   /** 冲队：每照片一批（新 batchId）；未满防抖窗的部分留给下一窗。 */
   function flushQueue(): void {
     if (flushTimer !== null) {
@@ -213,6 +228,7 @@ export function useLikes(inputs: LikesInputs) {
     if (flushTimer !== null) clearTimeout(flushTimer);
     for (const timer of retryTimers) clearTimeout(timer);
     retryTimers.clear();
+    localLikeListeners.clear();
   });
 
   return reactive({
@@ -221,6 +237,8 @@ export function useLikes(inputs: LikesInputs) {
     /** 点击动画 nonce（每次点击 +1，模板 :key 重挂触发动画）。 */
     popNonce: (photoId: string) => states.get(photoId)?.pop ?? 0,
     like,
+    /** 订阅本地点击动效事件（UI-02 V05 粒子等）。 */
+    onLocalLike,
     calibrate,
     ownDeltaIn,
     recalibrateFromList,

apps/viewer/src/pages/ActivityPage.vue

@@ -184,6 +184,17 @@ const currentPhoto = computed(() => {
   return sequence.photos.find((photo) => photo.photoId === lightboxPhotoId.value) ?? null;
 });
 
+/** 当前照片分享深链（V05 §5.4）：/a/:token/p/:photoId + lang 参数（当前 UI
+ * 语言），始终分享观众端路由——不分享 OSS 签名 URL。 */
+const photoShareUrl = computed(() => {
+  if (lightboxPhotoId.value === null) return undefined;
+  const href = router.resolve({
+    name: 'activity-photo',
+    params: { token: token.value, photoId: lightboxPhotoId.value },
+  }).href;
+  return `${href}?lang=${locale.value}`;
+});
+
 /** 下载控制器（P4a Task 4）：开关来自相册载荷，当前照片随大图键控。 */
 const download = useDownload({
   token,
@@ -344,19 +355,24 @@ onBeforeUnmount(() => {
       <PhotoFeed :sequence="sequence" :likes="likes" @open="openFromFeed" />
     </template>
 
-    <!-- 大图查看器（Task 8）：当前照片以 photoId 键控（v-model）。 -->
+    <!-- 大图查看器（Task 8）：当前照片以 photoId 键控（v-model）。V05 新增：
+         相册标题/照片深链（navigator.share）与实时气泡（粒子/互动提示分层）。 -->
     <PhotoLightbox
       v-if="lightboxPhotoId !== null && currentPhoto !== null"
       v-model:photo-id="lightboxPhotoId"
       :sequence="sequence"
       :likes="likes"
       :download="download"
+      :album-title="album !== null ? album.translation.title : undefined"
+      :share-url="photoShareUrl"
+      :like-bubbles="realtime.bubbles"
       @removed="onPhotoRemoved"
       @close="closeLightbox"
     />
 
-    <!-- 他人点赞气泡（Task 10）：点击定位打开该照片大图。 -->
+    <!-- 他人点赞气泡（Task 10）：点击定位打开该照片大图。大图打开期间改由
-    <LikeBubbles :bubbles="realtime.bubbles" @open="openFromFeed" />
+         查看器内互动提示承载（§6.2：避免页面级气泡被模态框盖住或遮住下载）。 -->
+    <LikeBubbles :bubbles="lightboxPhotoId === null ? realtime.bubbles : []" @open="openFromFeed" />
 
     <!-- 照片下线轻提示（大图 404 刷新 / WS hidden/deleted 推送移除时）。 -->
     <p v-if="photoRemovedNotice" class="removed-notice" role="status">{{ t('viewer.photoRemoved') }}</p>

apps/viewer/src/support/share.ts

@@ -0,0 +1,34 @@
+// apps/viewer/src/support/share.ts —— UI-02 §5.4 分享编排（Task 5 / V05）：
+// navigator.share 优先（成功后由原生分享面板收尾，应用内不再重复反馈；用户
+// 取消 AbortError 静默——不显示错误）；API 不可用或其他失败回退剪贴板
+// （copyText 已含 execCommand 兜底），复制失败由调用方展示可选中文本。
+// 始终分享观众端路由（相册 /a/:token、照片 /a/:token/p/:photoId?lang=…），
+// 不分享 OSS 签名 URL（§5.4）。
+import { copyText } from './clipboard';
+
+export type ShareOutcome =
+  | 'shared' // navigator.share 成功（原生 UI 已反馈）
+  | 'cancelled' // 用户取消原生分享（AbortError：静默，无错误）
+  | 'copied' // 回退剪贴板成功
+  | 'failed'; // 回退剪贴板失败（调用方展示可选中文本）
+
+/** navigator.share 是否可用（安全上下文 + 浏览器支持）。 */
+export function canNativeShare(): boolean {
+  return typeof navigator.share === 'function';
+}
+
+/** 原生分享优先，剪贴板兜底（§5.4）。 */
+export async function shareOrCopy(input: { title: string; url: string }): Promise<ShareOutcome> {
+  if (canNativeShare()) {
+    try {
+      await navigator.share({ title: input.title, url: input.url });
+      return 'shared';
+    } catch (error) {
+      if ((error as { name?: unknown } | null)?.name === 'AbortError') {
+        return 'cancelled';
+      }
+      // 其他失败（数据/权限/非安全上下文等）：继续剪贴板回退。
+    }
+  }
+  return (await copyText(input.url)) ? 'copied' : 'failed';
+}