Psychotoxical-psysonic

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Psychotoxical 7e8acd86d6 refactor(audio): extract sink swap + crossfade handoff into helper

Pull the atomic sink-swap block (~50 LOC) out of audio_play into
play_input::swap_in_new_sink. The helper takes a SinkSwapInputs
struct (sink, duration_secs, volume, gain_linear, fadeout trigger +
samples, crossfade flag, measured fade seconds) and:

1. Locks state.current, atomically replaces sink + duration + seek/play
   timestamps + volume + replay-gain + fade-out handles, returns the
   old sink + its old fade-out handles.
2. If crossfade is on: stores total fade samples, flips trigger atomic
   on the old TriggeredFadeOut, parks the old sink in fading_out_sink,
   spawns a small task that drops it after `fade_secs + 0.5 s`.
3. If crossfade is off: stops the old sink immediately.

Behaviour-preserving — same lock scope, same atomic ordering, same
cleanup-task lifetime. audio/commands.rs: 600 → 563 LOC. With this
the audio_play body has shrunk from the original ~760 LOC monolith
to a top-level orchestration of named helper calls.

2026-05-08 15:50:07 +02:00