👔 complete handler callback

Complete the logic checking and loading on the OAuth module callback handler.

features/oauth-callback/ui/LoadingProcess.tsx

@@ -0,0 +1,20 @@
+"use client";
+
+import { CircularProgress } from "@heroui/react";
+import React from "react";
+
+const LoadingProcess = () => {
+  return (
+    <div className="w-full flex flex-col items-center text-center mt-[26vh]">
+      <CircularProgress aria-label="Loading..." size="lg" />
+      <div className="mt-4">
+        <h1 className="text-lg text-neutral-200">Please wait...</h1>
+        <p className="text-sm text-neutral-400">
+          Your request is being processed
+        </p>
+      </div>
+    </div>
+  );
+};
+
+export default LoadingProcess;