Version history, notes on highlights and bookmarks, "you've studied this", prayer journal

- Earlier versions of a study: the server keeps compressed copies (about one per ten minutes of
  editing, the latest 30); Export shows what differs and puts one back (the replaced copy is kept)
- Notes on highlights and bookmarks: synced, merged without loss, in exports and backups
- Reader verse panel lists your studies and chunks that cover the verse, and opens them
- Prayer journal: requests, who for, linked verses, days prayed, answers; synced, in backups
  and the account export; daily prayer reminder through ntfy
- TODO.md lists the ideas not built yet

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

src/utils/backup.test.js

@@ -20,7 +20,7 @@ test('a backup holds the studies, marks and plans, and round-trips through valid
   expect(backup.projects.map((p) => p.id)).toEqual(['p1']);
   const checked = validateBackup(JSON.parse(JSON.stringify(backup)));
   expect(checked.ok).toBe(true);
-  expect(checked.summary).toEqual({ projects: 1, bookmarks: 1, highlights: 1, inkPages: 1, plans: 1 });
+  expect(checked.summary).toEqual({ projects: 1, bookmarks: 1, highlights: 1, inkPages: 1, prayers: 0, plans: 1 });
   expect(backupFileName(new Date('2026-10-01T12:00:00Z'))).toBe('bible-study-backup-2026-10-01.json');
 });
 
@@ -56,3 +56,15 @@ test('merging plans keeps every run once, preferring the later activity', () =>
   expect(merged.customPlans.map((p) => p.id)).toEqual(['c1', 'c2']);
   expect(merged.activity).toEqual(['2026-09-01', '2026-09-02']);
 });
+
+
+test('prayers are in the backup, deleted ones are not, and they survive validation', () => {
+  const prayers = [{ id: 'a', text: 'Peace', forWhom: '', verses: [], prayedOn: [], createdAt: 1, updatedAt: 2, answeredAt: null, answerNote: '' }, { id: 'b', deleted: true, updatedAt: 3 }];
+  const backup = buildBackup({ reader: {}, readingPlans: null, prayers });
+  expect(backup.prayers.map((p) => p.id)).toEqual(['a']);
+  const checked = validateBackup(JSON.parse(JSON.stringify(backup)));
+  expect(checked.ok).toBe(true);
+  expect(checked.summary.prayers).toBe(1);
+  expect(checked.backup.prayers[0].text).toBe('Peace');
+  expect(validateBackup({ app: 'bible-study-project', version: 1, prayers: [{ id: 'x' }, 5, { id: 'y', text: '  ' }] }).backup.prayers).toEqual([]);
+});