fix(audio): release idle output stream after 60s (#1071) (#1073)

* fix(audio): release idle output stream after 60s (#1071)

Lazy-open CPAL on first playback and close the device handle after one
minute without active audio so Windows can sleep; emit output-released
for cold resume and skip post-wake reopen when idle.

* docs: CHANGELOG and credits for idle audio stream fix (PR #1073)

* fix(audio): satisfy clippy if-same-then-else in idle watcher

* fix(audio): silence rodio DeviceSink drop unless logging is debug

Gate log_on_drop(false) on runtime should_log_debug() so normal/off
logging modes avoid stderr noise from intentional idle stream release.

* feat(audio): cold-start paused restore and silent engine prepare

After getPlayQueue on startup, apply saved seek position to the UI,
prefetch the current track to hot cache, and load the engine paused via
new audio_play startPaused so playback does not audibly start before
pause. Shared engineLoadTrackAtPosition with queue-undo restore.

* fix(audio): satisfy clippy too_many_arguments on stream arm helper

Bundle spawn_legacy_stream_start_when_armed parameters into
LegacyStreamStartWhenArmed so workspace clippy passes.

* fix(audio): release output stream immediately on stop (#1071)

Stop and natural queue end call audio_stop; close the CPAL device right
away instead of waiting for the 60s idle timer. Pause keeps the grace
period for warm resume.

* fix(audio): keep waveform mounted after stop (#1071)

Stop preserves currentTrack, so its cached analysis waveform stays valid.
Stop no longer nulls waveformBins for the still-shown track and re-hydrates
them from the analysis DB, instead of dropping to flat placeholder bars.

* test(audio): cover output_stream_is_needed branches; harden audio_play arg (#1071)

- Add unit tests for the idle-keepalive decision: empty/playing/paused main
  sink, preview and fading-out sinks, and radio playing/paused. Players are
  built device-less via rodio's Player::new + a Zero source, so empty()/state
  are exercised without an audio device.
- Make audio_play's `start_paused` an Option<bool> defaulting to false, so the
  new field is strictly additive (omitting startPaused no longer fails serde).
- Drop the unused `_engine` parameter from start_stream_idle_watcher; it
  resolves the engine from the AppHandle each poll.

* refactor(audio): extract sink-swap lifecycle into sink_swap module (#1071)

Move SinkSwapInputs/swap_in_new_sink and the legacy stream-arm helper
(LegacyStreamStartWhenArmed/spawn_legacy_stream_start_when_armed) out of
play_input.rs into a focused sink_swap.rs, so source selection and source
building stay separate from sink lifecycle. play_input.rs drops from 953 to
799 lines. No behavior change.

CHANGELOG.md

@@ -191,6 +191,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Fixed
 
+### Windows — idle app no longer blocks system sleep
+
+**By [@cucadmuh](https://github.com/cucadmuh), reported by [@Thraka](https://github.com/Thraka), PR [#1073](https://github.com/Psychotoxical/psysonic/pull/1073)**
+
+* Psysonic no longer keeps the audio output device open while the app is idle — the CPAL stream opens on first playback and closes after **60 seconds** without active audio (pause), or **immediately** on Stop / natural queue end, so Windows `powercfg` no longer reports an in-use audio stream when music is not playing ([#1071](https://github.com/Psychotoxical/psysonic/issues/1071)).
+* Resume after a long pause uses the existing cold path (`audio:output-released` resets the warm-pause flag); post-sleep recovery skips reopening the stream when nothing is playing.
+* **Cold start while paused:** after `getPlayQueue` restores position, the seekbar shows the saved time immediately; the current track is hot-cache prefetched and the engine loads silently (`audio_play` with `startPaused`) at that position so the next Play is a warm `audio_resume` without an audible blip at the start of the track.
+* Rodio `Dropping DeviceSink` warnings on stream release are suppressed unless logging is in debug mode.
+* **Stop keeps the waveform:** stopping no longer wipes the seekbar waveform for the still-shown track — the cached analysis bins are kept and re-hydrated from the database, so the real waveform stays mounted instead of falling back to flat bars.
+
 ### Internet radio — no more duplicate now-playing on Linux
 
 **By [@Psychotoxical](https://github.com/Psychotoxical), reported by agriffit79, PR [#1069](https://github.com/Psychotoxical/psysonic/pull/1069)**