feat(voice): expose reusable voice runtime #891

Job	Run time
Frontend checks and unit tests	9m 5s
Tauri Rust checks (Windows)	1m 50s
Tauri Rust checks (Linux)	3m 40s
Tauri Rust checks (macOS)	9m 5s
Frontend build smoke	1s
Transcript virtualization	1s
	23m 42s

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