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/components/CoTeachers.jsx

@@ -1,4 +1,4 @@
-// Export → Co-teachers: let other accounts edit this study with you. You make a single-use invite link;
+// Finish → Co-teachers: let other accounts edit this study with you. You make a single-use invite link;
 // whoever opens it (signed in) can edit the study, and you can remove them any time. Edits from both of you
 // sync through the account; if you both change the same study, "Combine both" keeps everything.
 import { useCallback, useEffect, useState } from 'react';

src/components/HandoutExport.jsx

@@ -1,4 +1,4 @@
-// Export → Lesson handout: a printable page for each session (or one session), for a group to follow along.
+// Finish → Lesson handout: a printable page for each session (or one session), for a group to follow along.
 import { useState } from 'react';
 import { HANDOUT_LAYOUTS, printHandout, sessionsFor } from '../utils/handout.js';
 

src/components/ImportNotes.jsx

@@ -1,4 +1,4 @@
-// Export → Import notes: bring notes from a Word or Markdown file into this study, matched to its chunks by passage.
+// Finish → Import notes: bring notes from a Word or Markdown file into this study, matched to its chunks by passage.
 import { useState } from 'react';
 import { useApp } from '../context/AppContext.js';
 import { useToast } from './Toasts.jsx';

src/components/SessionSchedule.jsx

@@ -1,4 +1,4 @@
-// Export → Schedule: the study's sessions (one per chunk) as a calendar file, starting on a date you pick.
+// Finish → Schedule: the study's sessions (one per chunk) as a calendar file, starting on a date you pick.
 import { useState } from 'react';
 import { formatChunkReference } from '../utils/bibleUtils.jsx';
 import { buildIcs, downloadIcs, sessionDates } from '../utils/icsFile.js';

src/components/SlidesExport.jsx

@@ -1,4 +1,4 @@
-// Export → Slides: a printable slide deck for a session or the whole study (Save as PDF in the print dialog).
+// Finish → Slides: a printable slide deck for a session or the whole study (Save as PDF in the print dialog).
 import { useState } from 'react';
 import { sessionsFor } from '../utils/handout.js';
 import { printSlides } from '../utils/slides.js';

src/components/VersionHistory.jsx

@@ -1,4 +1,4 @@
-// Export → Earlier versions: the copies the server kept of this study as you worked. Look at what is different
+// Finish → Earlier versions: the copies the server kept of this study as you worked. Look at what is different
 // from now, and put one back. The version you replace is kept, so putting one back can be undone too.
 import { useCallback, useEffect, useState } from 'react';
 import { getStudyVersion, listStudyVersions } from '../syncService.js';

src/components/study/StudioShell.jsx

@@ -10,7 +10,7 @@ export const STAGES = [
   { id: 'study', label: 'Study' },
   { id: 'outline', label: 'Outline' },
   { id: 'script', label: 'Script' },
-  { id: 'export', label: 'Export' },
+  { id: 'export', label: 'Finish' },
 ];
 const THEME_ORDER = ['paper', 'sepia', 'dark'];