fix: (Record) setTimeout instead of requestAnimationFrame

[katspaugh]

Short description

requestAnimationFrame has a different delay depending on the screen's FPS, so it results in a different continuous waveform speed. Changing it to setTimeout gives a more predictable result.

I've also optimized the performance of the continuousWaveform rendering:

• The smallest FFT size (32) because we only need one value per frame
• Math.max -> a loop

[cloudflare-workers-and-pages]

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