Highlight translation differences, first-draft snapshot, verse notes, paste check

- Compare translations can highlight the words that differ from the first
  translation (toggle remembered).
- A copy of your notes is kept the first time commentary is shown; "First draft,
  before commentary" under More shows what changed since. Saving it doesn't
  count as editing the chunk.
- Notes on single verses: a pencil next to each verse in Study, and a note line
  under each verse in Compare. They merge per verse across devices.
- Pasting 15+ words into a note asks "Is this from AI?"; "I wrote it" counts the
  words as yours again.

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

src/pages/StudyPage.jsx

@@ -129,6 +129,8 @@ export default function StudyPage() {
                 verses={verses} chapter={chapter}
                 interlinear={resources.interlinearData} interlinearLoading={resources.interlinearLoading}
                 addedStrongs={addedStrongs} onPickWord={pickWord}
+                verseNotes={selectedChunk.verseNotes ?? {}}
+                onVerseNote={(key, text) => updateChunk(selectedChunk.id, { verseNotes: { ...(selectedChunk.verseNotes ?? {}), [key]: text } })}
               />
             </div>
           ) : (