Rename the Export stage to Finish

It now holds files, sharing, handouts, slides, importing notes, schedule,
co-teachers and earlier versions, not just exports.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/pages/PronunciationPage.jsx

@@ -1,5 +1,5 @@
 // Every Greek and Hebrew word in the study with its transliteration, so a
-// speaker can rehearse them. Reached from the Script and Export stages.
+// speaker can rehearse them. Reached from the Script and Finish stages.
 import { useState } from 'react';
 import { useApp } from '../context/AppContext.js';
 import StudioShell from '../components/study/StudioShell.jsx';