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/pages/DrawCanvas.jsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useCallback, useState } from 'react';
+import { useEffect, useRef, useCallback, useMemo, useState } from 'react';
 import { useApp } from '../context/AppContext.js';
 import { renderInkToCanvas } from '../utils/inkRender.js';
 
@@ -35,8 +35,9 @@ export default function DrawCanvas({ strokes, onStrokesChange, onDone, headerCon
   const { pageCount: initPages } = extractMeta(strokes);
   const [pageCount, setPageCount] = useState(initPages);
 
-  // realStrokes = strokes without the metadata header
-  const { realStrokes } = extractMeta(strokes);
+  // realStrokes = strokes without the metadata header. Memoized so the canvas
+  // only redraws when the strokes actually change, not on every parent re-render.
+  const realStrokes = useMemo(() => extractMeta(strokes).realStrokes, [strokes]);
 
   const canvasRef = useRef(null);
   const hoverRef = useRef(null);