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/ExportPage.jsx

@@ -1,4 +1,4 @@
-// The Export stage: take the finished study out as a file, or share it read-only.
+// The Finish stage: everything for when a study is ready to use: files, sharing, handouts, slides, importing notes, schedule, co-teachers and earlier versions.
 import { useApp } from '../context/AppContext.js';
 import { useShareLink } from '../hooks/useShareLink.js';
 import SlidesExport from '../components/SlidesExport.jsx';
@@ -32,7 +32,7 @@ export default function ExportPage() {
     <StudioShell stage="export">
       <main className="mx-auto max-w-2xl space-y-5 px-4 py-8">
         <div>
-          <h1 className="text-xl font-medium">Export</h1>
+          <h1 className="text-xl font-medium">Finish</h1>
           <p className="mt-1 text-sm text-[var(--r-sub)]">{allChunks.length} chunk{allChunks.length === 1 ? '' : 's'} · {filled} script{filled === 1 ? '' : 's'} written</p>
         </div>
 

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';