Add Insights, Observe-first, compare, handout layouts, richer search, backup nudge

- Commentary and study aids wait for 15 words of your own Observe notes.
- Insights page: this week's own work, themes across studies, words you keep
  studying, what slipped in recalls, open follow-ups.
- Recall can record what slipped; session notes (teach it back, who came,
  group notes, follow-ups); "Pray about this" from Apply.
- Compare any two passages side by side.
- Handout layouts: standard, questions only, large print, note-taking.
- Search understands "in <book>", "last week/month/year" and a year.
- Home shows the last backup age and nudges after two weeks.
- Phone: the stage bar scrolls instead of clipping Script and Export.

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

src/components/settings/DataSection.jsx

@@ -4,7 +4,7 @@ import { useApp } from '../../context/AppContext.js';
 import { useToast } from '../Toasts.jsx';
 import { DownloadProgress } from '../OfflineSave.jsx';
 import { useOfflineSave } from '../../hooks/useOfflineSave.js';
-import { backupFileName, buildBackup, restoreProjects, validateBackup } from '../../utils/backup.js';
+import { backupFileName, buildBackup, markBackedUp, restoreProjects, validateBackup } from '../../utils/backup.js';
 import { saveRemoteProject } from '../../syncService.js';
 
 const btn = 'rounded-xl border border-[var(--r-line)] px-4 py-2 text-sm hover:bg-black/5 disabled:opacity-50';
@@ -38,6 +38,7 @@ export default function DataSection() {
     link.click();
     link.remove();
     URL.revokeObjectURL(url);
+    markBackedUp();
     toast(`Backup downloaded: ${plural(backup.projects.length, 'study', 'studies')} and your reading marks`);
   };