Terminal-style real-time log viewer with:
- Log file selector (app, post-processing, acoustid, source reuse)
- Color-coded log levels (DEBUG gray, INFO blue, WARNING yellow, ERROR red)
- Level filter buttons (All/Debug/Info/Warn/Error)
- Auto-scroll with toggle, copy and clear buttons
- Live updates via WebSocket (2s polling, pushes new lines)
- Initial load fetches last 200 lines via REST API
- 1000-line display cap with oldest lines trimmed
Also fixes Advanced tab settings (Discovery Pool, Security, etc.) being
hidden inside collapsed Library Preferences section body — misplaced
closing div caused them to be invisible.
8b0e619fa1