fix: headless mode

src/webui/components/browser_use_agent_tab.py

@@ -387,6 +387,9 @@ async def run_agent_task(
     )  # Logic handled by CDP/WSS presence
     keep_browser_open = get_browser_setting("keep_browser_open", False)
     headless = get_browser_setting("headless", False)
+    # Force headless if running in a server without X11 (e.g., Hugging Face Spaces)
+    if not headless and not os.getenv("DISPLAY"):
+        headless = True
     disable_security = get_browser_setting("disable_security", False)
     window_w = int(get_browser_setting("window_w", 1280))
     window_h = int(get_browser_setting("window_h", 1100))