Studying: daily five minutes, reading list, plan-day studies use your template

- Home: "Your five minutes": a rotating Observe/Interpret/Apply prompt on the
  passage whose matching note is thinnest in your own words, a 5:00 clock and a
  box that appends to that note. Pasting is blocked; sessions show in Insights.
- Study: a Reading list tab (R) for the study: books and articles to consult,
  with a note and a tick; merges across devices.
- Starting a study from a reading-plan day now uses the notes template you last
  picked when starting a study by hand (logic moved to utils/planStudy.js).

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

src/pages/InsightsPage.jsx

@@ -39,7 +39,7 @@ export default function InsightsPage() {
             <Stat label="Your own words" value={week.ownShare === null ? '–' : `${week.ownShare}%`} />
             <Stat label="Recalls done" value={week.recalls} />
           </div>
-          {week.teachBacks > 0 && <p className="mt-2 text-xs text-[var(--r-sub)]">{week.teachBacks} teach-it-back summar{week.teachBacks === 1 ? 'y' : 'ies'} written.</p>}
+          {(week.teachBacks > 0 || week.fiveMinutes > 0) && <p className="mt-2 text-xs text-[var(--r-sub)]">{[week.fiveMinutes > 0 && `${week.fiveMinutes} five-minute session${week.fiveMinutes === 1 ? '' : 's'}`, week.teachBacks > 0 && `${week.teachBacks} teach-it-back summar${week.teachBacks === 1 ? 'y' : 'ies'}`].filter(Boolean).join(' · ')} this week.</p>}
         </section>
 
         <section aria-label="Open follow-ups" className={card}>