feat: show alert when shift is updated

hrms/hr/doctype/employee_checkin/employee_checkin.js

@@ -18,14 +18,22 @@ frappe.ui.form.on("Employee Checkin", {
 
 	add_fetch_shift_button(frm) {
 		frm.add_custom_button(__("Fetch Shift"), function () {
+			const previous_shift = frm.doc.shift;
 			frappe.call({
 				method: "fetch_shift",
 				doc: frm.doc,
 				freeze: true,
 				freeze_message: __("Fetching Shift"),
 				callback: function () {
+					if (previous_shift === frm.doc.shift) return;
 					frm.dirty();
 					frm.save();
+					frappe.show_alert({
+						message: __("Shift has been successfully updated to {0}.", [
+							frm.doc.shift,
+						]),
+						indicator: "green",
+					});
 				},
 			});
 		});