Fix: stepType was being set to an object

src/types/global.d.ts

@@ -66,4 +66,16 @@ declare global {
   interface Window {
     electronAPI: ElectronAPI;
   }
+}
+
+/**
+ * Vue instance interface extension for global properties.
+ * 
+ * This makes global properties available on Vue instances
+ * in TypeScript without type errors.
+ */
+declare module 'vue' {
+  interface ComponentCustomProperties {
+    $notify: (notification: any, timeout?: number) => void;
+  }
 }