fix(transcription): write stderr to the error log instead of a phantom buffer

make-process :stderr was a file path, but :stderr takes a buffer, so Emacs made a buffer named after the path instead of writing the file. The "Errored.  Logs in <file>" notification pointed at a log with no error text, and that hidden buffer leaked one per transcription.

I now route stderr through an explicit, erased buffer: passed to :stderr, threaded to the sentinel, drained into the log, then killed. That keeps stderr off the stdout :buffer, so the transcript stays clean.

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