feat(music): prefetch 2 tracks ahead instead of 1

Complements the WebRTC auto-reconnect: a track already sitting in
blobCacheRef needs no live connection to play, so whatever was fetched
before a screen lock started plays through it regardless of what the
transport is doing during the lock. One track of runway was often shorter
than the lock itself; two buys more of it. MAX_CACHED_BLOBS (3) already
covers the currently-playing track plus these two, so no cache-size change
needed.

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