perf: reduce CPU usage and unify next-track buffering settings

- Throttle audio:progress from 100ms to 500ms; WaveformSeek and
  FsSeekbar use imperative DOM updates instead of React re-renders
- Fix all usePlayerStore() calls without selectors across pages and
  components (useShallow / individual selectors throughout)
- Remove filter:blur and transform:scale from Hero, AlbumDetail and
  FullscreenPlayer backgrounds — eliminated expensive software
  compositing layers on WebKitGTK
- Replace translate3d with 2D translate in FS mesh and portrait
  animations; remove will-change:transform from mesh blobs
- Move Hot Cache section from Storage tab to Audio tab; group Preload
  and Hot Cache under a shared 'Next Track Buffering' section with a
  mutual-exclusivity note and auto-disable logic
- Add 'off' toggle to Preload (replaces Off button with toggle switch);
  enabling either method now automatically disables the other

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/locales/zh.ts

@@ -565,6 +565,9 @@ export const zhTranslation = {
     gaplessDesc: '预缓冲下一首曲目以消除歌曲间的间隙',
     preloadMode: '预加载下一曲目',
     preloadModeDesc: '何时开始缓冲队列中的下一曲目',
+    nextTrackBufferingTitle: '下一曲目缓冲',
+    preloadHotCacheMutualExclusive: '预加载与热缓存用途相同——两者不能同时启用。启用其中一个会自动禁用另一个。',
+    preloadOff: '关闭',
     preloadBalanced: '均衡（结束前30秒）',
     preloadEarly: '提前（播放5秒后）',
     preloadCustom: '自定义',