Voices cloned from a Script Rehearsal now show the script title in the
SOURCE column without requiring manual entry. `_displaySource()` parses
the note field (`Rehearser · <title> · <character> — …`) and returns the
title segment as the source. Explicit `origin` values still take priority.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>