fix: simplify conditional checks and improve async handler usage across multiple files (#5156)

* fix: simplify conditional checks and improve async handler usage across multiple files

* fix: add missing AsyncHandler import in find_processes_by_name function

* fix: remove redundant AsyncHandler import in find_processes_by_name function

src-tauri/src/core/notification.rs

@@ -96,9 +96,9 @@ impl NotificationSystem {
 
         while !handle.is_exiting() {
             match rx.recv_timeout(std::time::Duration::from_millis(100)) {
-                Ok(event) => Self::process_event(&handle, event),
+                Ok(event) => Self::process_event(handle, event),
                 Err(mpsc::RecvTimeoutError::Disconnected) => break,
-                Err(mpsc::RecvTimeoutError::Timeout) => continue,
+                Err(mpsc::RecvTimeoutError::Timeout) => break,
             }
         }
     }