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/utils/insights.js

@@ -25,6 +25,7 @@ export function weeklySummary(projects, now = Date.now()) {
     ownWords: ownWordsTotal,
     ownShare: shares.length ? Math.round(shares.reduce((a, b) => a + b, 0) / shares.length) : null,
     recalls: all.reduce((n, { chunk }) => n + (chunk.recalls ?? []).filter((r) => now - (r.at ?? 0) < WEEK_MS).length, 0),
+    fiveMinutes: all.reduce((n, { chunk }) => n + (chunk.fiveMinutes ?? []).filter((f) => now - (f.at ?? 0) < WEEK_MS).length, 0),
     teachBacks: recent.filter(({ chunk }) => (chunk.teachBack ?? '').trim()).length,
   };
 }