The old pattern passed a Span in every channel message and entered it
with a guard that was held across await points, which misattributed
events from interleaved tasks. Messages are now {span, command} pairs:
the span is captured automatically at send time (Span::current) and the
consumer instruments the whole handler future with a child span
(playback_command/provider_command with a command name field), so events
are attributed correctly across the queue boundary and all the manual
in_current_span() plumbing is gone.
Also:
- server: EnvFilter with RUST_LOG support (default: own crates at
debug, rest at info), log-crate bridge for symphonia/cpal
- cbd-tui: logs to a file under the state dir (the terminal belongs to
the TUI), EnvFilter, no more println into the alternate screen
- tidaldy: fix misused levels (error->debug), structured fields,
payload dumps moved to trace, login flow at info/warn
- no panic on missing notification daemon in the TUI
- no panic on backwards clock steps in QueueManager
- provider init errors propagate instead of expect()
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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