feat: add headless display mode

daemon/src/display/headless.rs

@@ -0,0 +1,16 @@
+use log::info;
+use tokio::sync::mpsc::Receiver;
+use tokio::sync::oneshot;
+use tokio_util::task::TaskTracker;
+
+use crate::config;
+use crate::display::DisplayState;
+
+pub fn update_ui(
+    _task_tracker: &TaskTracker,
+    _config: &config::Config,
+    _ui_shutdown_rx: oneshot::Receiver<()>,
+    _ui_update_rx: Receiver<DisplayState>,
+) {
+    info!("Headless mode, not spawning UI.");
+}