Version history, notes on highlights and bookmarks, "you've studied this", prayer journal

- Earlier versions of a study: the server keeps compressed copies (about one per ten minutes of
  editing, the latest 30); Export shows what differs and puts one back (the replaced copy is kept)
- Notes on highlights and bookmarks: synced, merged without loss, in exports and backups
- Reader verse panel lists your studies and chunks that cover the verse, and opens them
- Prayer journal: requests, who for, linked verses, days prayed, answers; synced, in backups
  and the account export; daily prayer reminder through ntfy
- TODO.md lists the ideas not built yet

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

src/hooks/useProjectLibrary.js

@@ -171,6 +171,14 @@ export function useProjectLibrary({
     setCurrentPage(hasSelectedChunk ? 'study' : 'setup');
   };
 
+  // Opens a study on one particular chunk (from the Reader's "In your studies").
+  const openStudyChunk = (id, chunkId) => {
+    const loaded = loadProjectById(id);
+    if (!loaded) return;
+    setProject({ ...loaded, selectedChunkId: chunkId });
+    setCurrentPage('study');
+  };
+
   const renameProjectInStorage = (id, title) => {
     const loaded = loadProjectById(id);
     if (!loaded) return;
@@ -276,6 +284,7 @@ export function useProjectLibrary({
     staleLocalProjects,
     autoRestoredCount,
     resumeProject,
+    openStudyChunk,
     renameProjectInStorage,
     setProjectSeries,
     deleteProject,