feat(ipc): connect GUI to daemon via D-Bus reload and live status detection

desktop/platform-linux/src/watcher.rs

@@ -74,6 +74,16 @@ impl Watcher {
         // thread exits when the connection drops.
         let _ = self.sink.send(event);
     }
+
+    /// Instruct the daemon to reload schedules from the database immediately.
+    fn reload_schedules(&self) {
+        let _ = self.sink.send(FocusEvent::ReloadSchedules);
+    }
+
+    /// Ping method to check if the daemon is alive.
+    fn ping(&self) -> bool {
+        true
+    }
 }
 
 /// Acquire the bus name and export [`Watcher`], returning the live connection.
@@ -115,3 +125,25 @@ pub fn serve(sink: Sender<FocusEvent>) -> Result<Connection, WatcherError> {
 pub fn release(connection: &Connection) {
     let _ = connection.release_name(BUS_NAME);
 }
+
+/// Tell the running daemon via D-Bus to reload schedules from storage.
+pub fn notify_daemon_reload() -> Result<(), zbus::Error> {
+    let conn = Connection::session()?;
+    let proxy =
+        zbus::blocking::Proxy::new(&conn, BUS_NAME, OBJECT_PATH, "vu.valiq.blocker.Watcher")?;
+    let _: () = proxy.call("ReloadSchedules", &())?;
+    Ok(())
+}
+
+/// Query if the daemon is running and responding on D-Bus.
+pub fn is_daemon_running() -> bool {
+    if let Ok(conn) = Connection::session() {
+        if let Ok(proxy) =
+            zbus::blocking::Proxy::new(&conn, BUS_NAME, OBJECT_PATH, "vu.valiq.blocker.Watcher")
+        {
+            let res: zbus::Result<bool> = proxy.call("Ping", &());
+            return res.unwrap_or(false);
+        }
+    }
+    false
+}