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/ScripturePane.jsx

@@ -3,8 +3,9 @@
 import { useState } from 'react';
 import { NT_BOOK_NUMBER } from '../../utils/bibleUtils.jsx';
 
-export default function ScripturePane({ verses, chapter, interlinear, interlinearLoading, addedStrongs, onPickWord }) {
+export default function ScripturePane({ verses, chapter, interlinear, interlinearLoading, addedStrongs, onPickWord, verseNotes = {}, onVerseNote }) {
   const [openVerse, setOpenVerse] = useState(null);
+  const [editingNote, setEditingNote] = useState(null);
   const isHebrew = chapter && !NT_BOOK_NUMBER[chapter.bookAbbrev];
   return (
     <section aria-label="Scripture" className="rounded-2xl border border-[var(--r-line)] bg-[var(--r-bar)] px-5 py-4">
@@ -20,6 +21,17 @@ export default function ScripturePane({ verses, chapter, interlinear, interlinea
                 {v.chapter !== chapter?.chapter ? `${v.chapter}:` : ''}{v.number}
               </button>
               <span>{v.text}</span>
+              {onVerseNote && (
+                <button type="button" onClick={() => setEditingNote(editingNote === `${v.chapter}:${v.number}` ? null : `${v.chapter}:${v.number}`)}
+                  aria-label={`Note on verse ${v.number}`} title="Note on this verse"
+                  className={`ml-1.5 align-baseline font-sans text-[0.7em] ${verseNotes[`${v.chapter}:${v.number}`] ? 'text-[var(--r-accent)]' : 'text-[var(--r-sub)] opacity-40 hover:opacity-100'}`}>✎</button>
+              )}
+              {(verseNotes[`${v.chapter}:${v.number}`] || editingNote === `${v.chapter}:${v.number}`) && (
+                <textarea aria-label={`Verse ${v.number} note`} value={verseNotes[`${v.chapter}:${v.number}`] ?? ''} rows={2} autoFocus={editingNote === `${v.chapter}:${v.number}`}
+                  onChange={(e) => onVerseNote?.(`${v.chapter}:${v.number}`, e.target.value)}
+                  placeholder="Your note on this verse"
+                  className="mt-1 block w-full resize-y rounded-lg border border-[var(--r-line)] bg-[var(--r-bg)] px-2.5 py-1.5 font-sans text-[13px] leading-snug text-[var(--r-text)] focus:outline-none focus:ring-2 focus:ring-[var(--r-line)]" />
+              )}
               {open && words && (
                 <div dir={isHebrew ? 'rtl' : 'ltr'} className="mt-2 flex flex-wrap gap-2 rounded-xl bg-[var(--r-bg)] p-2.5 font-sans">
                   {words.map((w, i) => {