feat: add fallback tunnel status check and improve Windows service command calls

Add fallback to tunnel_status when metrics query fails in current_metrics function, returning zero bytes with actual tunnel state. Update waitForTunnelStatus in frontend to use tunnel_status instead of tunnel_metrics for status polling and refresh metrics separately on success. Change CloseRequested window event handler to call app_handle().exit(0) instead of no-op. Replace "sc" with "sc.exe" in all Windows service command

desktop-client/src-tauri/src/lib.rs

@@ -403,11 +403,21 @@ fn current_metrics(app: &AppHandle) -> Result<TunnelMetrics, String> {
         let session = session.as_ref().ok_or_else(|| "No active session is available".to_string())?;
         session.profile_path.clone()
     };
-    tunnel_manager::metrics(app, std::path::Path::new(&profile_path)).map(|metrics| TunnelMetrics {
-        active: metrics.active,
-        rx_bytes: metrics.rx_bytes,
-        tx_bytes: metrics.tx_bytes,
-    })
+    match tunnel_manager::metrics(app, std::path::Path::new(&profile_path)) {
+        Ok(metrics) => Ok(TunnelMetrics {
+            active: metrics.active,
+            rx_bytes: metrics.rx_bytes,
+            tx_bytes: metrics.tx_bytes,
+        }),
+        Err(_) => {
+            let active = tunnel_manager::is_active(app, std::path::Path::new(&profile_path))?;
+            Ok(TunnelMetrics {
+                active,
+                rx_bytes: 0,
+                tx_bytes: 0,
+            })
+        }
+    }
 }
 
 async fn sync_current_session(app: &AppHandle) -> Result<SessionState, String> {
@@ -658,7 +668,9 @@ pub fn run() {
             Ok(())
         })
         .on_window_event(|window, event| match event {
-            WindowEvent::CloseRequested { .. } => {}
+            WindowEvent::CloseRequested { .. } => {
+                window.app_handle().exit(0);
+            }
             WindowEvent::Resized(_) => {
                 if window.is_minimized().unwrap_or(false) {
                     hide_main_window(window);