feat(viewer): hide like feature — action bar like slot, photo like badges, hot sort tab, others' like bubbles (user request 2026-09-23)

- PhotoFeed: cell like badge not rendered
- AlbumHeader: sort tabs row removed (hot depends on likes; latest-only has no toggle value)
- PhotoActionBar: like slot v-if=false (share/download remain, auto re-center)
- ActivityPage: LikeBubbles hidden
- specs updated to hidden assertions; 244 green

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

apps/viewer/src/pages/ActivityPage.vue

@@ -372,7 +372,8 @@ onBeforeUnmount(() => {
 
     <!-- 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
          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" />
+    <!-- 他人点赞气泡：已按用户要求隐藏（2026-09-23，先隐藏点赞功能）。 -->
+    <LikeBubbles v-if="false" :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>