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/signup.test.js

@@ -0,0 +1,24 @@
+// @vitest-environment node
+import { test, expect } from 'vitest';
+import { checkSignup, generateInviteCode, normalizeInviteCode, isSignupMode } from './signup.js';
+
+test('open lets anyone in; the first account is always allowed', () => {
+  expect(checkSignup({ mode: 'open', userCount: 5, inviteOk: false }).ok).toBe(true);
+  expect(checkSignup({ mode: 'closed', userCount: 0, inviteOk: false }).ok).toBe(true);
+  expect(checkSignup({ mode: 'invite', userCount: 0, inviteOk: false }).ok).toBe(true);
+});
+
+test('invite-only needs a good code, closed lets nobody in', () => {
+  expect(checkSignup({ mode: 'invite', userCount: 2, inviteOk: false })).toMatchObject({ ok: false, status: 403 });
+  expect(checkSignup({ mode: 'invite', userCount: 2, inviteOk: true }).ok).toBe(true);
+  expect(checkSignup({ mode: 'closed', userCount: 2, inviteOk: true })).toMatchObject({ ok: false, status: 403 });
+});
+
+test('invite codes are readable and typed forgivingly', () => {
+  const code = generateInviteCode();
+  expect(code).toMatch(/^[A-HJKMNP-Z2-9]{4}-[A-HJKMNP-Z2-9]{4}-[A-HJKMNP-Z2-9]{4}$/);
+  expect(normalizeInviteCode(` ${code.toLowerCase().replace(/-/g, ' ')} `)).toBe(code);
+  expect(normalizeInviteCode('abcd2345jkmn')).toBe('ABCD-2345-JKMN');
+  expect(isSignupMode('invite')).toBe(true);
+  expect(isSignupMode('nope')).toBe(false);
+});