"Pronunciation" on a character card edits the node's `replace` setting
(script text -> what the character reads). Each row can be heard as the
character reads it now (the saved table applies) and as replaced, through
a Preview Audio run that stays out of the audio gallery; one preview at a
time, cancelled when the dialog closes. The file is re-read before editing
and every other settings field is kept. buildTtsPrompt gains `preview`.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
