fix(clipboard-manager): Drop on exit (#2280)

* fix(clipboard-manager): Drop on exit

ref https://docs.rs/arboard/latest/arboard/struct.Clipboard.html
ref https://github.com/tauri-apps/plugins-workspace/issues/2267

* more specific

plugins/clipboard-manager/src/lib.rs

@@ -11,7 +11,7 @@
 
 use tauri::{
     plugin::{Builder, TauriPlugin},
-    Manager, Runtime,
+    Manager, RunEvent, Runtime,
 };
 
 #[cfg(desktop)]
@@ -59,5 +59,11 @@ pub fn init<R: Runtime>() -> TauriPlugin<R> {
             app.manage(clipboard);
             Ok(())
         })
+        .on_event(|_app, _event| {
+            #[cfg(desktop)]
+            if let RunEvent::Exit = _event {
+                _app.clipboard().cleanup();
+            }
+        })
         .build()
 }