Voices table: removed Length, Duration, Time — only Factor and WPM remain
from benchmark data. Setup → Benchmark batch results now shows Duration,
Factor (sorted fastest-first, colour-coded), Time, and WPM. Factor replaces
Avg RTF with the same data flipped to a more intuitive direction (higher=better).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>