App quality: offline badge, per-note history, keyboard study mode, notes import

- Study cards say whether the Bible text works offline, with a button to save
  the missing book (notes are always kept on the device).
- Each note keeps its last 12 versions with Restore (History under each note).
- Keyboard-only study: 1/2/3 write in Observe/Interpret/Apply, C/W/X/P switch
  resource tabs, V compares, Esc leaves a note box; listed under "?".
- Export > Import notes: bring Word/Markdown/text notes into the matching
  chunks without overwriting anything; can mark them as not your own.

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

src/components/study/NotesPane.jsx

@@ -1,9 +1,10 @@
 // Observe / Interpret / Apply as an accordion (one open at a time), plus a "More"
 // area for background notes and tags so the page stays quiet.
-import { useEffect, useState } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import SessionNotes from './SessionNotes.jsx';
 import FirstDraft from './FirstDraft.jsx';
 import { usePasteCheck } from './PastePrompt.jsx';
+import { listNoteVersions, recordNoteVersion } from '../../utils/noteHistory.js';
 import DictateButton, { appendSpoken } from '../DictateButton.jsx';
 import { ownShare, ownWords, pastedWords, clearPastes } from '../../utils/ownWork.js';
 import { templateFromChunk, templatePrompt } from '../../utils/studyTemplates.js';
@@ -20,11 +21,25 @@ const SECTIONS = [
 const areaCls = 'w-full resize-y rounded-xl border border-[var(--r-line)] bg-[var(--r-bg)] px-3.5 py-3 font-serif text-[15px] leading-7 text-[var(--r-text)] placeholder:font-sans placeholder:text-[13px] placeholder:leading-5 placeholder:text-[var(--r-sub)] focus:outline-none focus:ring-2 focus:ring-[var(--r-line)]';
 const words = (s) => (s ?? '').trim().split(/\s+/).filter(Boolean).length;
 
-export default function NotesPane({ chunk, updateChunk, allTags, templateId, saveTemplate, notify, onPray }) {
+export default function NotesPane({ chunk, updateChunk, allTags, templateId, saveTemplate, notify, onPray, focusRequest }) {
   const [open, setOpen] = useState(() => {
     try { return localStorage.getItem('studyNotesOpen') || 'observation'; } catch { return 'observation'; }
   });
   const [more, setMore] = useState(false);
+  // A keyboard jump (1 / 2 / 3 on the Study page): open that note and put the cursor in it.
+  const areas = useRef({});
+  const wanted = useRef(null);
+  useEffect(() => {
+    if (!focusRequest) return;
+    wanted.current = focusRequest.field;
+    setOpen(focusRequest.field);
+  }, [focusRequest]);
+  useEffect(() => {
+    if (wanted.current && wanted.current === open) {
+      const el = areas.current[open];
+      if (el) { el.focus(); const end = el.value.length; el.setSelectionRange(end, end); wanted.current = null; }
+    }
+  });
   const [tplName, setTplName] = useState('');
   const [tplOpen, setTplOpen] = useState(false);
   const [tagInput, setTagInput] = useState('');
@@ -42,6 +57,25 @@ export default function NotesPane({ chunk, updateChunk, allTags, templateId, sav
 
   const share = ownShare(chunk);
   const pasteCheck = usePasteCheck(chunk, updateChunk);
+  // Earlier versions of one note: kept when you start and stop editing it; "History" lists them with Restore.
+  const [historyField, setHistoryField] = useState(null);
+  const [versions, setVersions] = useState([]);
+  useEffect(() => { setHistoryField(null); }, [chunk.id]);
+  const keepVersion = (field) => {
+    const list = recordNoteVersion(chunk.id, field, chunk[field]);
+    if (historyField === field) setVersions(list);
+  };
+  const openHistory = (field) => {
+    if (historyField === field) { setHistoryField(null); return; }
+    recordNoteVersion(chunk.id, field, chunk[field]);
+    setVersions(listNoteVersions(chunk.id, field));
+    setHistoryField(field);
+  };
+  const restore = (field, text) => {
+    recordNoteVersion(chunk.id, field, chunk[field]); // so restoring can itself be undone
+    updateChunk(chunk.id, { [field]: text });
+    setVersions(listNoteVersions(chunk.id, field));
+  };
 
   return (
     <section aria-label="Study notes" className="space-y-2">
@@ -72,9 +106,21 @@ export default function NotesPane({ chunk, updateChunk, allTags, templateId, sav
             </button>
             {isOpen && (
               <div className="px-4 pb-4">
-                <textarea aria-label={label} value={chunk[field] ?? ''} rows={7} placeholder={templatePrompt(templateId, field) ?? placeholder}
-                  onPaste={pasteCheck.onPaste(field)} onChange={(e) => updateChunk(chunk.id, { [field]: e.target.value })} className={areaCls} />
+                <textarea ref={(el) => { areas.current[field] = el; }} aria-label={label} value={chunk[field] ?? ''} rows={7} placeholder={templatePrompt(templateId, field) ?? placeholder}
+                  onFocus={() => keepVersion(field)} onBlur={() => keepVersion(field)} onPaste={pasteCheck.onPaste(field)} onChange={(e) => updateChunk(chunk.id, { [field]: e.target.value })} className={areaCls} />
                 {pasteCheck.prompt(field)}
+                <button type="button" onClick={() => openHistory(field)} aria-expanded={historyField === field} className="mt-1.5 mr-3 text-xs text-[var(--r-sub)] hover:text-[var(--r-text)]">History</button>
+                {historyField === field && (
+                  <ul aria-label={`${label} history`} className="mt-1.5 space-y-1.5 rounded-xl border border-[var(--r-line)] p-2 text-xs">
+                    {versions.length === 0 && <li className="text-[var(--r-sub)]">No earlier versions yet. They are saved as you edit.</li>}
+                    {versions.map((v) => (
+                      <li key={v.at} className="flex items-baseline justify-between gap-3">
+                        <span className="min-w-0"><span className="text-[var(--r-sub)]">{new Date(v.at).toLocaleString([], { month: 'short', day: 'numeric', hour: 'numeric', minute: '2-digit' })} · {words(v.text)} words · </span><span className="font-serif">{v.text.length > 70 ? `${v.text.slice(0, 70)}…` : v.text}</span></span>
+                        <button type="button" onClick={() => restore(field, v.text)} disabled={v.text === chunk[field]} className="shrink-0 text-[var(--r-accent)] hover:underline disabled:opacity-40 disabled:no-underline">Restore</button>
+                      </li>
+                    ))}
+                  </ul>
+                )}
                 {pasted > 0 && (
                   <p className="mt-1.5 text-xs text-[var(--r-sub)]">
                     {pasted} word{pasted === 1 ? '' : 's'} here were pasted, so they don't count as your own work.{' '}