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>

setup.sh

@@ -1,6 +1,20 @@
 #!/usr/bin/env bash
+# Installs dependencies, builds the frontend, and runs the app.
+#
+#   bash setup.sh         Production: one Express server serves the optimized
+#                         build + API on $APP_PORT (default 5173).
+#   bash setup.sh --dev   Development: Express API on 3001 + Vite dev server
+#                         with hot reload (slower; not for real users).
 set -euo pipefail
 
+MODE="prod"
+if [ "${1:-}" = "--dev" ]; then
+  MODE="dev"
+fi
+
+# Production serves on the port the Vite dev server used to use, so an
+# existing reverse proxy pointed at it keeps working. Override with APP_PORT=.
+APP_PORT="${APP_PORT:-5173}"
 PREFERRED_VITE_PORT=5173
 MAX_VITE_PORT=5200
 API_PORT=3001
@@ -41,7 +55,7 @@ stop_pid_file() {
   fi
 }
 
-echo "=== Bible Study App Setup ==="
+echo "=== Bible Study App Setup ($MODE) ==="
 echo ""
 
 # ── Node check ───────────────────────────────────────────────────────────────
@@ -68,7 +82,35 @@ echo ""
 echo "Installing dependencies..."
 npm install
 
-# ── Find a free Vite port ─────────────────────────────────────────────────────
+# ── Production ────────────────────────────────────────────────────────────────
+if [ "$MODE" = "prod" ]; then
+  # Build before stopping anything, so a failed build leaves the running site up.
+  echo ""
+  echo "Building frontend..."
+  npm run build
+
+  stop_pid_file "$API_PID_FILE" "server"
+  stop_pid_file "$VITE_PID_FILE" "Vite dev server"
+
+  echo ""
+  echo "Starting production server on http://localhost:$APP_PORT"
+  echo "Logs: $API_LOG_FILE"
+
+  NODE_ENV=production PORT="$APP_PORT" \
+    nohup node "$ROOT_DIR/server/index.js" > "$API_LOG_FILE" 2>&1 &
+  echo $! > "$API_PID_FILE"
+  echo "Server PID: $(cat "$API_PID_FILE")"
+
+  echo ""
+  echo "To stop:       kill \$(cat .api.pid)"
+  echo "To view logs:  tail -f .api.log"
+  exit 0
+fi
+
+# ── Development ───────────────────────────────────────────────────────────────
+stop_pid_file "$API_PID_FILE" "API server"
+stop_pid_file "$VITE_PID_FILE" "Vite server"
+
 echo ""
 VITE_PORT=$(find_port)
 if [ -z "$VITE_PORT" ]; then
@@ -82,11 +124,6 @@ else
   echo "Port $VITE_PORT is available for Vite."
 fi
 
-# ── Stop any previously running instances ─────────────────────────────────────
-stop_pid_file "$API_PID_FILE" "API server"
-stop_pid_file "$VITE_PID_FILE" "Vite server"
-
-# ── Start Express API server ──────────────────────────────────────────────────
 echo ""
 echo "Starting API server on http://localhost:$API_PORT"
 echo "API logs: $API_LOG_FILE"
@@ -98,7 +135,6 @@ echo "API server PID: $(cat "$API_PID_FILE")"
 # Give the API a moment to initialise before Vite starts
 sleep 1
 
-# ── Start Vite dev server ─────────────────────────────────────────────────────
 echo ""
 echo "Starting Vite dev server on http://localhost:$VITE_PORT"
 echo "Vite logs: $VITE_LOG_FILE"
@@ -112,4 +148,4 @@ echo "Both servers are running."
 echo ""
 echo "To stop both:       kill \$(cat .api.pid) \$(cat .vite.pid)"
 echo "To view API logs:   tail -f .api.log"
-echo "To view Vite logs:  tail -f .vite.log"
+echo "To view Vite logs:  tail -f .vite.log"