Speed up the app, run production build, remove chunk ink, start App.jsx split

Performance:
- Lazy-load pages, docx, and mammoth (initial JS 1,298 KB -> ~290 KB)
- Gzip responses and cache hashed assets for a year
- Memoize DrawCanvas strokes so ink isn't redrawn on every render
- Precompute whole-Bible search index and defer the query while typing
- Reload once if a lazy chunk is missing after a deploy

Deployment:
- setup.sh builds and runs one production server on APP_PORT (default
  5173); --dev keeps the old Vite dev setup
- Session cookie uses secure: 'auto' so login works behind any proxy

Chunk editor:
- Remove the Draw layout, Ink Notes panel, and ink in HTML export
  (existing inkStrokes data is left in saved projects)

Refactor:
- Move module-level helpers out of App.jsx into src/utils/*
- Extract Bible reader state and logic into hooks/useBibleReader

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

src/utils/bibleIndexCache.js

@@ -0,0 +1,46 @@
+// IndexedDB cache for the whole-Bible search index.
+const BIBLE_IDB_NAME = 'study-app-bible-index';
+const BIBLE_IDB_STORE = 'bible-index';
+export const BIBLE_IDB_TTL = 7 * 24 * 60 * 60 * 1000; // 7 days
+
+function openBibleIndexDB() {
+  return new Promise((resolve, reject) => {
+    const req = indexedDB.open(BIBLE_IDB_NAME, 1);
+    req.onupgradeneeded = (e) => {
+      const db = e.target.result;
+      if (!db.objectStoreNames.contains(BIBLE_IDB_STORE)) {
+        db.createObjectStore(BIBLE_IDB_STORE, { keyPath: 'id' });
+      }
+    };
+    req.onsuccess = (e) => resolve(e.target.result);
+    req.onerror = () => reject(req.error);
+  });
+}
+
+export async function getBibleIndexFromIDB(translation) {
+  try {
+    const db = await openBibleIndexDB();
+    return new Promise((resolve, reject) => {
+      const tx = db.transaction(BIBLE_IDB_STORE, 'readonly');
+      const req = tx.objectStore(BIBLE_IDB_STORE).get(translation);
+      req.onsuccess = () => resolve(req.result ?? null);
+      req.onerror = () => reject(req.error);
+    });
+  } catch {
+    return null;
+  }
+}
+
+export async function saveBibleIndexToIDB(translation, flat) {
+  try {
+    const db = await openBibleIndexDB();
+    await new Promise((resolve, reject) => {
+      const tx = db.transaction(BIBLE_IDB_STORE, 'readwrite');
+      const req = tx.objectStore(BIBLE_IDB_STORE).put({ id: translation, flat, cachedAt: Date.now() });
+      req.onsuccess = () => resolve();
+      req.onerror = () => reject(req.error);
+    });
+  } catch {
+    // Non-fatal; in-memory cache still works for this session
+  }
+}