The player sends the token in a header too, not just the downloader

The last thing standing between the token and the query string it should not
be in. The downloader moved to an Authorization header a while back; the player
never did, and the player is how the car plays anything not already on disk.
Withdrawing the query parameter without this would have broken streaming in the
car silently -- a 401 arriving as "playback failed".

ExoPlayer resolves a URL on its own loading thread with no coroutine to read
DataStore in, so ServerAudioAuth caches the configuration and the session
callback refreshes it before handing over any stream URL. Nothing is cached per
URL: the same player fetches publisher audio, and the whole point of
ServerBearer is that those get nothing. Attached through a ResolvingDataSource
rather than as a default request property for the same reason -- a default
would send Peter's server credentials to every podcast CDN he subscribes to.

Before the first refresh it sends nothing, which is the safe direction: a
stream that should have carried the token fails visibly, where one that should
not have carried it would have leaked it.

Verified against the live server, not a fake: the player reaches READY on
listen.terst.org audio with a header and no token in the URL, and the same URL
without credentials is still refused. The token is supplied as an
instrumentation argument and is not in the repository -- a test file carrying
it would be the same mistake in a different file -- so the test skips unless
one is passed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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