Files
minstrel/flutter_client/lib/playlists
bvandeusen f4d07ef9a1 diag(flutter): trace playlist provider — wire vs drift vs filter
Web UI shows system playlists; Flutter shows placeholders. Wire shape,
adapters, drift schema, and filter constants all line up on inspection,
so adding instrumentation to pinpoint where the system rows fall out:

- Log what /api/playlists?kind=all actually returns (owned/public
  counts, including how many of owned are system).
- Log what cacheFirst sees on each drift emit: total rows, filtered,
  how many are system, how many landed in owned vs pub, plus the
  user.id used for the owned-vs-pub split.

Also add the 3s connectivity timeout that albumProvider/artistProvider
got — keeps the alwaysRefresh path from blocking on a stalled
connectivity stream.

Three log lines from one home-screen visit will tell us:
- Does the server emit system rows? (wire log: system=N)
- Do they land in drift? (drift log: filtered system=N)
- Do they survive the user-id filter? (drift log: owned system=N)
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