wip: Optimize macOS recording pipeline with M4S muxer and async finalization (+ optimisations) #5079

Job	Run time
Lint (Biome)	11s
Typecheck	1m 13s
Format (Biome)	7s
Format (Cargo)	11s
Detect Changes	7s
Clippy (aarch64-apple-darwin, macos-latest)	1m 10s
Verify Tauri plugin versions	8s
Clippy (x86_64-pc-windows-msvc, windows-latest)	4m 0s
Rust cache	0s
Build Desktop	0s
	7m 7s

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