Each configured GUI app (e.g. Nextcloud) gets its own dock icon and
opens as a regular Atlus tab. Under the hood: Xvfb virtual display,
ImageMagick captures individual window pixmaps as JPEG, streams over
WebSocket to a canvas element, with xdotool forwarding mouse/keyboard
input back to the X11 window. Apps persist in background when tab is
closed, and streaming pauses when no viewers are attached.
New files: backend/display.py (DisplayManager + ManagedGuiApp),
backend/routers/display.py (WebSocket + REST), frontend display.js/css.
Config: gui_apps array in settings for registered applications.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
