New logbuffer.py captures app messages (log()) and library logs (faster-whisper,
huggingface_hub) into a ring buffer, mirrored to stderr. Settings gains a Log
tab: monospace view, 1s refresh, auto-scroll, Copy, Clear — so model
download/load progress is visible instead of an opaque "Loading…". transcribe
and daemon now log via the buffer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
