fix(wasapi): racy timestamp callback padding#1246
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This was referenced Jun 9, 2026
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Pre-v0.18 the WASAPI playback timestamps were not monotonic because the padding calculation was backward. v0.18 made that go away for the most part here, but still keeps a tiny window between two syscalls that could make it go awry.
This PR does an atomic read on the callback timestamp and playback position instead of those two syscalls.
Fixes BillyDM/Firewheel#43