286c30696f
iOS Safari does not reliably support MediaSource for audio/mpeg streaming, causing an 'audio decode error' when the MSE SourceBuffer path is used. Detect iOS (and any browser without audio/mpeg MSE support) at runtime and fall back to a single fetch(...).blob() download with stream:false. Playback begins after the full chapter audio is received rather than mid-stream, but it works on all devices. Desktop browsers keep the existing MSE streaming path (stream:true) for faster time-to-first-audio. The same detection applies to the next-chapter prefetch pipeline.