fix: remove infinite re-render loop in useSessionAccessToken

The hook was maintaining redundant local state that caused re-renders
on every update, which triggered NextAuth to continuously refetch the
session, resulting in hundreds of POST requests to /api/auth/session.

Simplified the hook to directly return session values without
unnecessary state duplication.

www/app/lib/useSessionAccessToken.ts

@@ -1,42 +1,15 @@
 "use client";
 
-import { useState, useEffect } from "react";
 import { useSession as useNextAuthSession } from "next-auth/react";
 import { CustomSession } from "./types";
 
 export default function useSessionAccessToken() {
   const { data: session } = useNextAuthSession();
   const customSession = session as CustomSession;
-  const naAccessToken = customSession?.accessToken;
-  const naAccessTokenExpires = customSession?.accessTokenExpires;
-  const naError = customSession?.error;
-  const [accessToken, setAccessToken] = useState<string | null>(null);
-  const [accessTokenExpires, setAccessTokenExpires] = useState<number | null>(
-    null,
-  );
-  const [error, setError] = useState<string | undefined>();
-
-  useEffect(() => {
-    if (naAccessToken !== accessToken) {
-      setAccessToken(naAccessToken);
-    }
-  }, [naAccessToken]);
-
-  useEffect(() => {
-    if (naAccessTokenExpires !== accessTokenExpires) {
-      setAccessTokenExpires(naAccessTokenExpires);
-    }
-  }, [naAccessTokenExpires]);
-
-  useEffect(() => {
-    if (naError !== error) {
-      setError(naError);
-    }
-  }, [naError]);
 
   return {
-    accessToken,
-    accessTokenExpires,
-    error,
+    accessToken: customSession?.accessToken ?? null,
+    accessTokenExpires: customSession?.accessTokenExpires ?? null,
+    error: customSession?.error,
   };
 }