refactor: replace async runtime with blocking thread for tray menu refresh and mark unused state parameter

Replace tauri::async_runtime::spawn with std::thread::spawn for periodic tray menu refresh background task and change async sleep to blocking thread sleep. Prefix unused state parameter with underscore in sync_profile command to suppress compiler warnings.

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

@@ -264,7 +264,7 @@ fn clear_session(app: AppHandle, state: State<'_, AppState>) -> Result<(), Strin
 }
 
 #[tauri::command]
-async fn sync_profile(app: AppHandle, state: State<'_, AppState>) -> Result<EnrollmentResult, String> {
+async fn sync_profile(app: AppHandle, _state: State<'_, AppState>) -> Result<EnrollmentResult, String> {
     let session_state = sync_current_session(&app).await?;
     refresh_tray_menu(&app);
     Ok(session_state.enrollment)
@@ -666,11 +666,9 @@ pub fn run() {
             refresh_tray_menu(app.handle());
 
             let app_handle = app.handle().clone();
-            tauri::async_runtime::spawn(async move {
-                loop {
+            std::thread::spawn(move || loop {
                 refresh_tray_menu(&app_handle);
-                    tauri::async_runtime::sleep(std::time::Duration::from_secs(5)).await;
-                }
+                std::thread::sleep(std::time::Duration::from_secs(5));
             });
 
             Ok(())