fix(cast): keep the Chromecast progress log out of the terminal

The receiver reports its state on a timer, so `player status: PLAYING` repeats
for as long as a film runs and buries everything else in the terminal the app
was started from. The progress lines now go through Node's own `debuglog`,
which costs nothing when disabled — the message is never formatted — and is
restored with:

    NODE_DEBUG=cast-chromecast npm start

The socket error stays on console.error. It fires when the connection to the
receiver dies and is the only trace of why a cast stopped; routing it through
the same switch would make the one failure worth seeing the one that
disappears.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UGY17EPph5LsLzePPXhUVc

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