Robustness fixes

docker-compose.yml

@@ -5,8 +5,10 @@ services:
     build: .
     env_file:
       - .env
-    devices:
-      - /dev/usb/lp0:/dev/usb/lp0
+    privileged: true  # Required for /dev access when printer powers on/off
     volumes:
       - ./output:/app/output  # For test PNGs
+      - ./client.py:/app/client.py  # Mount source for live updates
+      - ./templates.py:/app/templates.py  # Mount templates for live updates
+      - /dev:/dev  # Mount /dev for dynamic device access
     restart: unless-stopped