Implement Auth.

src/components/auth/No_Session.tsx

@@ -0,0 +1,10 @@
+import Sign_In from "./Sign_In";
+
+export default function No_Session() {
+  return (
+    <div className="w-2/3 mx-auto text-center pt-10">
+      <h1 className="text-2xl font-semibold">Unauthorized. Please sign in first.</h1>
+      < Sign_In />
+    </div>
+  );
+};

src/components/auth/Sign_In.tsx

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+import { signIn } from "~/auth";
+
+export default async function Sign_In() {
+  return (
+    <form className="w-full"
+      action={async () => {
+        "use server";
+        await signIn("microsoft-entra-id");
+      }}>
+      <button type="submit" className="w-full">Sign In</button>
+    </form>
+  );
+}