chore(playback): remove Preload Next Track setting (#1007)

* chore(playback): remove Preload Next Track setting

The configurable next-track RAM preload duplicated hot cache and is
obsolete now that ranged streaming starts playback sooner. Gapless and
crossfade still use the internal audio_preload backup when hot cache is off.

* docs: add CHANGELOG entry for Preload Next Track removal (PR #1007)

src/store/authPlumbingActions.ts

@@ -6,23 +6,19 @@ type SetState = (
 
 /**
  * Persistent plumbing settings that don't fit a more specific domain:
- * runtime logging level, Navidrome `getNowPlaying` toggle, preload
- * mode + custom seconds, audiobook exclusion, genre blacklist.
+ * runtime logging level, Navidrome `getNowPlaying` toggle, audiobook
+ * exclusion, genre blacklist.
  */
 export function createPlumbingSettingsActions(set: SetState): Pick<
   AuthState,
   | 'setLoggingMode'
   | 'setNowPlayingEnabled'
-  | 'setPreloadMode'
-  | 'setPreloadCustomSeconds'
   | 'setExcludeAudiobooks'
   | 'setCustomGenreBlacklist'
 > {
   return {
     setLoggingMode: (v) => set({ loggingMode: v }),
     setNowPlayingEnabled: (v) => set({ nowPlayingEnabled: v }),
-    setPreloadMode: (v) => set({ preloadMode: v }),
-    setPreloadCustomSeconds: (v) => set({ preloadCustomSeconds: v }),
     setExcludeAudiobooks: (v) => set({ excludeAudiobooks: v }),
     setCustomGenreBlacklist: (v) => set({ customGenreBlacklist: v }),
   };