Use undo toast for integration removal instead of immediate action

src/window.rs

@@ -921,10 +921,35 @@ impl DriftwoodWindow {
                 let toast_overlay = window.imp().toast_overlay.get().unwrap().clone();
                 if let Ok(Some(record)) = db.get_appimage_by_id(record_id) {
                     if record.integrated {
+                        // Remove integration immediately, offer undo toast
                         integrator::undo_all_modifications(&db, record_id).ok();
                         integrator::remove_integration(&record).ok();
                         db.set_integrated(record_id, false, None).ok();
-                        toast_overlay.add_toast(adw::Toast::new("Integration removed"));
+
+                        let undo_toast = adw::Toast::builder()
+                            .title("Removed from app menu")
+                            .button_label("Undo")
+                            .build();
+
+                        let db_undo = db.clone();
+                        let window_weak_undo = window.downgrade();
+                        undo_toast.connect_button_clicked(move |_| {
+                            let Some(win) = window_weak_undo.upgrade() else { return };
+                            if let Ok(Some(rec)) = db_undo.get_appimage_by_id(record_id) {
+                                match integrator::integrate_tracked(&rec, &db_undo) {
+                                    Ok(result) => {
+                                        let desktop_path = result.desktop_file_path.to_string_lossy().to_string();
+                                        db_undo.set_integrated(record_id, true, Some(&desktop_path)).ok();
+                                    }
+                                    Err(e) => log::error!("Re-integration failed: {}", e),
+                                }
+                                let lib_view = win.imp().library_view.get().unwrap();
+                                if let Ok(records) = db_undo.get_all_appimages() {
+                                    lib_view.populate(records);
+                                }
+                            }
+                        });
+                        toast_overlay.add_toast(undo_toast);
                     } else {
                         match integrator::integrate_tracked(&record, &db) {
                             Ok(result) => {