[BUG] Option `Enable Dark Mode` is missing

[Tomblarom]

Current Behavior

I'm missing the option to enable darkmode:

This seems to be a common issue with OrcaSlicer as Flatpak/AppImage

• (Linux) Dark mode Checkbox missing OrcaSlicer/OrcaSlicer#883
• Dark Mode doesn't work on Linux appimage. OrcaSlicer/OrcaSlicer#6374
• Unable to select dark mode in flatpak build OrcaSlicer/OrcaSlicer#8518

Steps To Reproduce

1. Apply docker-config below
2. Open web-ui
3. Menu -> Preferences

Environment

- Debian 13 6.12.86+deb13-amd64
- Docker 29.4.3, build 055a478

CPU architecture

x86-64

Docker creation

services:
  orcaslicer:
    image: lscr.io/linuxserver/orcaslicer:latest
    container_name: orcaslicer
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Etc/UTC
      - PIXELFLUX_WAYLAND=false
    ports:
      - 5000:3001
    volumes:
      - /docker/orcaslicer:/config
      - /etc/localtime:/etc/localtime:ro
    shm_size: 2gb
    restart: unless-stopped

[Tomblarom]

Workaround

It can be enabled by following those steps:

1. sudo docker exec -it orcaslicer bash
2. nano /config/.config/OrcaSlicer/OrcaSlicer.conf
3. Set "dark_color_mode": "1" and save
4. Add GTK_THEME=Adwaita:dark to docker .env

You can also test by running: GTK_THEME=Adwaita:dark ./opt/orcaslicer/AppRun