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/components/study/ResourcePane.jsx

@@ -25,6 +25,13 @@ export default function ResourcePane({ tab, setTab, chunk, chapter, chapterIndex
   const [unlocked, setUnlocked] = useState(() => new Set());
   useEffect(() => { setUnlocked(new Set()); }, [chunk.id]);
   const held = (tab === 'commentary' || tab === 'aids') && !observeFirstDone(chunk) && !unlocked.has(chunk.id);
+  // The first time commentary or study aids are on screen for a chunk, keep a copy of your notes as they were,
+  // so you can later see what changed after reading others (shown under "More" in the notes).
+  const seeing = (tab === 'commentary' || tab === 'aids') && !held;
+  useEffect(() => {
+    if (!seeing || chunk.firstDraft) return;
+    updateChunk(chunk.id, { firstDraft: { at: Date.now(), observation: chunk.observation ?? '', interpretation: chunk.interpretation ?? '', application: chunk.application ?? '' } }, { touch: false });
+  }, [seeing, chunk.id, chunk.firstDraft]); // eslint-disable-line react-hooks/exhaustive-deps
   const counts = { words: chunk.greekWords.length, refs: (chunk.crossReferences ?? []).length };
   return (
     <div className="flex min-h-0 flex-1 flex-col">