Move study editor state into StudyPage and hooks

- StudyPage owns layout/tabs/collapsed sections, tags, DOCX script
  import, chunk navigation, keyboard shortcuts, and the selected-chunk
  values derived from the project.
- useStudyResources: commentary + interlinear for the selected chunk's
  chapter. These now load only on the study page (they previously also
  fetched while on Setup).
- useCrossRefs: typed refs, dataset suggestions, verse text.
- useWordStudy: word entries, Strong's lookups, suggestion picker.
- Fix: study-page messages (word suggestions, DOCX import, lookups) set a
  status that only SetupPage displayed, so they were never seen. They
  now show as a toast on the study page.
- copyVerse moves into ReaderPage.
- Tests: toast, arrow-key navigation, cross-refs, tags.

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

src/pages/ReaderPage.jsx

@@ -7,6 +7,11 @@ import DrawCanvas from './DrawCanvas.jsx';
 
 const NO_STROKES = []; // stable fallback so DrawCanvas doesn't redraw every render
 
+// Copies "Book 3:16 BSB — text" to the clipboard.
+const copyVerse = (bookName, chapterNum, verseNum, text) => {
+  navigator.clipboard?.writeText(`${bookName} ${chapterNum}:${verseNum} BSB — ${text}`);
+};
+
 export default function ReaderPage() {
   const {
     goHome,
@@ -42,7 +47,6 @@ export default function ReaderPage() {
     handlePlayReaderAudio,
     handleToggleReaderAudioPause,
     handleStopBookAudio,
-    copyVerse,
     setReaderCrossRefs,
     readerInkByPage,
     updateReaderPageInk,