Volume snapped between 1% steps from two integer quantizers. UI: the volume sliders now use a 0..1000 scale so the shared int slider's round() lands on 0.1% (imperceptible). Runtime: the player volume atomic widened from integer-percent AtomicU64 to f32-bits AtomicU32 (same idiom as normalization_gain) so a continuous value no longer re-snaps on track restart / device switch / gapless. Bit-perfect untouched: 1.0f32 round-trips its bits, no gain multiply or ramp added to the protected ALSA-direct / DoP / JACK paths.
cc
vicrodh
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