Invite-only sign-up, present mode, series, handouts, templates, dictation, progress, sharing

- Admin: sign-up Open / Invite only / Closed with single-use invite links
- Present mode for scripts (auto-scroll) and outlines (step through, pace vs planned minutes)
- Series: group studies on the dashboard, filter by series, calendar file for a study's sessions
- Lesson handout: printable page per session (passage, outline, questions, writing lines)
- Save a chunk's notes as your own study template (synced)
- Voice dictation for notes and scripts (browser speech recognition)
- Reading progress: map of the 66 books and a calendar of days read, synced and merged across devices
- Export highlights and bookmarks as Markdown or Word, grouped by named colour
- Verse of the day push to the ntfy topic (needs IQBIBLE_API_KEY)
- Sharing: co-teacher editing via single-use invite links; read-only links can expire and take a passcode

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

server/prefs.test.js

@@ -67,3 +67,14 @@ test('the database keeps one row per user', async () => {
   expect(db.getUserPrefs('u1')).toEqual({ theme: { v: 'sepia', at: 2 } });
   expect(db.getUserPrefs('u2')).toEqual({});
 });
+
+test('study templates are kept only when well-formed, and trimmed to sane sizes', async () => {
+  const { cleanPrefValue } = await import('./prefs.js');
+  const good = { id: 'user-abc1', name: ' Lesson ', description: 'x', prompts: { observation: 'Look', junk: 'no' }, starters: { generalNotes: 'Context:', bogus: 'no' } };
+  expect(cleanPrefValue('studyTemplates', [good, { id: 'other', name: 'bad id' }, { id: 'user-2' }, null])).toEqual([
+    { id: 'user-abc1', name: 'Lesson', description: 'x', prompts: { observation: 'Look' }, starters: { generalNotes: 'Context:' } },
+  ]);
+  expect(cleanPrefValue('studyTemplates', 'nope')).toBeUndefined();
+  expect(cleanPrefValue('studyTemplates', Array.from({ length: 30 }, (_, i) => ({ id: `user-${i}`, name: `T${i}` }))).length).toBe(12);
+  expect(cleanPrefValue('studyTemplates', [{ id: 'user-a', name: 'x', starters: { observation: 'y'.repeat(5000) } }])[0].starters.observation.length).toBe(2000);
+});