wip: Optimize macOS recording pipeline with M4S muxer and async finalization (+ optimisations) #5082

Job	Run time
Format (Biome)	9s
Lint (Biome)	11s
Format (Cargo)	14s
Detect Changes	8s
Typecheck	13s
Verify Tauri plugin versions	5m 1s
Clippy (x86_64-pc-windows-msvc, windows-latest)	1s
Clippy (aarch64-apple-darwin, macos-latest)	1s
Rust cache	0s
Build Desktop	0s
	5m 58s

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