Normalize audio frame rate in AudioMixer output #4231

Job	Run time
Detect Changes	6s
Typecheck	1m 19s
Lint (Biome)	11s
Format (Biome)	9s
Build Desktop (x86_64-pc-windows-msvc, windows-latest)	10m 6s
Format (Cargo)	11s
Build Desktop (aarch64-apple-darwin, macos-latest)	3m 42s
Clippy	1m 2s
Verify Tauri plugin versions	-1s
	16m 45s

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