Fix cpal 0.17.0 API compatibility in sample rate usage

[Copilot]

The cpal upgrade from 0.16.0 to 0.17.0 introduced a breaking change where SampleRate changed from a struct to a u32 type alias.

Changes

• cli/src/main.rs: Removed .0 field access from sample_rate() call since it now returns u32 directly

// Before (cpal 0.16.0)
let engine = Engine::new(rx, config.sample_rate().0 as f32);

// After (cpal 0.17.0)
let engine = Engine::new(rx, config.sample_rate() as f32);

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[Copilot]

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