refactor: remove electron-related code

src/pages/secondary/LoadingPage/index.tsx

@@ -0,0 +1,11 @@
+import SecondaryPageLayout from '@/layouts/SecondaryPageLayout'
+
+export default function LoadingPage({ title }: { title?: string }) {
+  return (
+    <SecondaryPageLayout titlebarContent={title}>
+      <div className="text-muted-foreground text-center">
+        <div>Loading...</div>
+      </div>
+    </SecondaryPageLayout>
+  )
+}