player_set_volume passed `volume` through untouched. Each backend clamps to 0.0..=1.0 for itself, so local playback was already safe, but the remote branch reaches no backend: it converts with `(volume * 100.0) as i32`, which turns infinity into i32::MAX. NaN is handled explicitly since f32::clamp returns NaN for a NaN input and it then survives every comparison downstream. TRACES: DR-212 | UT-206