Merge branch 'main' into exp/orbit (pre-PR sync)

Conflicts resolved in:
- src/pages/SearchResults.tsx
- src/pages/AdvancedSearch.tsx

Both pages were rewritten on main (PR #303) to use the shared
<SongRow> component with click-to-enqueueAndPlay semantics. Orbit's
playSong helper that branched on orbit-active is no longer needed
at the page level — instead, orbit awareness moved INTO SongRow and
SongCard themselves: in an active orbit session both buttons collapse
into addTrackToOrbit (suggest for guests, host-enqueue for the host)
so we don't ship a queue replacement to every guest.

Also kept main's IntersectionObserver-based pagination on both pages.

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

src/locales/zh.ts

@@ -21,6 +21,7 @@ export const zhTranslation = {
     cancelDownload: '取消下载',
     offlineLibrary: '离线音乐库',
     genres: '流派',
+    tracks: '曲目',
     playlists: '播放列表',
     mostPlayed: '最常播放',
     radio: '网络电台',
@@ -40,6 +41,7 @@ export const zhTranslation = {
     mostPlayed: '最常播放',
     recentlyPlayed: '最近播放',
     discover: '发现',
+    discoverSongs: '发现曲目',
     loadMore: '加载更多',
     discoverMore: '发现更多',
     discoverArtists: '发现艺术家',
@@ -376,6 +378,20 @@ export const zhTranslation = {
     offlineQueuing: '正在将 {{count}} 张专辑加入离线队列…',
     offlineFailed: '添加 {{name}} 离线失败',
   },
+  tracks: {
+    title: '曲目',
+    subtitle: '浏览。搜索。发现。',
+    heroEyebrow: '此刻精选',
+    heroReroll: '换一首',
+    playSong: '播放',
+    enqueueSong: '加入队列',
+    railRandom: '随机精选',
+    browseTitle: '浏览所有曲目',
+    browseUnsupported: '此服务器不支持一次性列出整个音乐库。使用上方的搜索来查找特定曲目。',
+    searchPlaceholder: '按标题、艺人或专辑搜索…',
+    count_one: '{{count}} 首曲目',
+    count_other: '{{count}} 首曲目',
+  },
   artists: {
     title: '艺术家',
     search: '搜索…',