hotfix(frontend): update profile handle URL hint (#13159) (#13168)

## Summary

Hotfix cherry-pick of #13148 onto `master`.

Prod currently shows wrong domain `autogpt.com/@your-handle` in the
profile handle hint. We don't own `autogpt.com` and NordVPN flags it as
malware — urgent fix requested by @Torantulino.

- Cherry-picked commit: `50c5b8b1ee`
- Original dev PR: #13148

## Test plan

- [x] Verify profile handle hint shows correct domain on prod after
deploy
- [x] CI green

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Co-authored-by: Abhimanyu Yadav <122007096+Abhi1992002@users.noreply.github.com>