fix(reader): mount app volume in docker-compose, move popup to body root and add smooth scroll tracking

docker-compose.yml

@@ -7,6 +7,7 @@ services:
       - "127.0.0.1:8002:8002"
     volumes:
       - ./data:/app/data
+      - ./app:/app/app
     environment:
       - HOST=0.0.0.0
       - PORT=8002